"Mineral Classics" - Dealing in fine minerals and gems for over 45 years! Online since 2002!

 











*** Welcome to Mineral Classics! Sunday, December 17, 2017... Our database contains 2589 specimens, encompassing 187 species... Please be sure to check out our new fully searchable database feature (click on the Search Site button on the left side of the screen)




Worldwide Rare Gemstones



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Sphalerite from Septemvri mine, Madan Ore Field, Rhodope Mts, Smolyan Oblast, Bulgaria [./gems717/sphalbulg949a.JPG] Sphalerite from Septemvri mine, Madan Ore Field, Rhodope Mts, Smolyan Oblast, Bulgaria [./gems717/sphalbulg949b.JPG] Sphalerite from Septemvri mine, Madan Ore Field, Rhodope Mts, Smolyan Oblast, Bulgaria [./gems717/sphalbulg949c.JPG]

Gemstone # SPHALBULG949
Name: Sphalerite
Locality: Septemvri mine, Madan Ore Field, Rhodope Mts, Smolyan Oblast, Bulgaria
Weight: 9.49 carats
Size: 13.01 mm
Price per Carat: SOLD
Price For Stone: SOLD
      Cut: Mumble Brilliant
Color: Green
Clarity: Very very very slightly included
Cut by Us: yes
Availability: sold

Comments:

Gem quality Sphalerite is found around the world in virtually every color of the rainbow except for blue and purple. Arguably the finest GREEN Sphalerites are those from the Madan Ore Field in Bulgaria. This area has produced some of the world's most intense green gems, with larger stones and excellent clarity. This particular stone was cut by Brett Kosnar of Kosnar Gem Co in June of 2017 and shows a rich green hue that is highlighted by flashes of yellow, blue-green, gold and orange. Due to the high refractive index of Sphalerite, the material will dance with color under strong lighting. This stone probably looks best in direct sunlight, but any strong light will show off the color well. Perhaps the most impressive aspect of the stone is that it shows only a TINY bit of inclusions, which is remarkable for a nearly 10 carat gem! If you look at the final photo (shot through the pavilion), you can see the clarity is quite impressive. It was a difficult stone to photograph, and I really think it looks better in person. A fantastic, large collector quality gem with a custom cut from this famous ore deposit in Bulgaria.

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Friedelite (rare) from Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex County, New Jersey [./gems717/friednj087a.JPG] Friedelite (rare) from Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex County, New Jersey [./gems717/friednj087b.JPG]

Gemstone # FRIEDNJ087
Name: Friedelite (rare)
Locality: Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex County, New Jersey
Weight: 0.87 carats
Size: 8.57 x 5.55 mm
Price per Carat: $ 400.00 (=~ £ 272.28)
Price For Stone: $ 348.00 (=~ £ 236.88)
      Cut: Pear Brilliant
Color: Orange-Red
Clarity: Translucent
Cut by Us: No
Availability: Available

Comments:

With the hundreds of species found at Franklin and Sterling Hill, there are only a few that are worthy to yield cut stones. A few that come to mind are Willemite, Zincite and Friedelite. Most species from Franklin are either too tiny, too devoid of color or too freaking rare to even consider cutting into gems. Friedelite is a cool phyllosilicate and the historic mining district at Franklin is probably the only place in the world to yield gemmy enough crystals for faceting. This stone has a very pleasing characteristic orange-red hue and the typical fuzzy appearance. I've never seen a completely eye clean gem of Friedelite from Franklin, and stones this size are considered to be large for the material. This is definitely in the rare category, and with such an attractive color, combined with the fact that the stone is nearly a full carat in weight, it is a superb stone for collectors.

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Datolite from Prospect Park Quarry, Passaic County, New Jersey [./gems717/datonj033a.JPG] Datolite from Prospect Park Quarry, Passaic County, New Jersey [./gems717/datonj033b.JPG]

Gemstone # DATONJ033
Name: Datolite
Locality: Prospect Park Quarry, Passaic County, New Jersey
Weight: 0.33 carats
Size: 4.22 x 4.15 mm
Price per Carat: $ 150.00 (=~ £ 102.10)
Price For Stone: $ 49.50 (=~ £ 33.69)
      Cut: Cushion Brilliant
Color: Light Greenish-Yellow
Clarity: Very Slightly Included
Cut by Us: No
Availability: Available

Comments: Datolite is a not a very common gem, as most localities do not produce gem material for cutting stones of any size. This gem is a very attractive stone with good brilliance and excellent cutting. The stone is very slightly included, which is not uncommon for Datolite, especially from this locality! The rough from which this stone was cut came from a specimen collected by my father, Richard A. Kosnar in 1964 at the famous Prospect Park Quarry in New Jersey. The stone is not your typical colorless material, but actually shows a light greenish-yellow hue, which is much more desirable, even in smaller stones. It has a very attractive Cushion Brilliant cut. With the Russian Datolite disappearing from the market over the last 10 years, and nothing to ever come out of Prospect Park again (the quarry is closed and being filled in for a housing development) and no other sources of gem material available, these stone are becoming more and more difficult to find in any quantity. A wonderful and hard to find, rare U.S. gemstone for all you collectors out there.

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Datolite from Prospect Park Quarry, Passaic County, New Jersey [./gems717/datonj026a.JPG] Datolite from Prospect Park Quarry, Passaic County, New Jersey [./gems717/datonj026b.JPG]

Gemstone # DATONJ026
Name: Datolite
Locality: Prospect Park Quarry, Passaic County, New Jersey
Weight: 0.26 carats
Size: 4.12 mm
Price per Carat: $ 225.00 (=~ £ 153.16)
Price For Stone: $ 58.50 (=~ £ 39.82)
      Cut: Round Brilliant
Color: Light Greenish-Yellow
Clarity: Nearly Eye Clean
Cut by Us: No
Availability: Available

Comments: Datolite is a not a very common gem, as most localities do not produce gem material for cutting stones of any size. This gem is a very attractive stone with good brilliance and excellent cutting. The stone is very slightly included, which is not uncommon for Datolite, especially from this locality! The rough from which this stone was cut came from a specimen collected by my father, Richard A. Kosnar in 1964 at the famous Prospect Park Quarry in New Jersey. The stone is not your typical colorless material, but actually shows a light greenish-yellow hue, which is much more desirable, even in smaller stones. It has a very attractive Round Brilliant cut and superb nearly eye clean clarity! With the Russian Datolite disappearing from the market over the last 10 years, and nothing to ever come out of Prospect Park again (the quarry is closed and being filled in for a housing development) and no other sources of gem material available, these stone are becoming more and more difficult to find in any quantity. A wonderful and hard to find, rare U.S. gemstone for all you collectors out there.

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Vivianite (very rare) from Herja Mine, Chiuzbaia, Baia Mare, Maramures Co., Romania [./gems717/vivrom014a.JPG] Vivianite (very rare) from Herja Mine, Chiuzbaia, Baia Mare, Maramures Co., Romania [./gems717/vivrom014b.JPG]

Gemstone # VIVROM014
Name: Vivianite (very rare)
Locality: Herja Mine, Chiuzbaia, Baia Mare, Maramures Co., Romania
Weight: 0.14 carats
Size: 5.34 x 2.09 mm
Price per Carat: SOLD
Price For Stone: SOLD
      Cut: Freeform
Color: Blue / Green (depending upon angle)
Clarity: Very slighty included
Cut by Us: No
Availability: sold

Comments:

Vivianite is one of those gems that few people have seen, mostly due to the fact that the material has a hardness of about 1.5 and perfect cleavage. The material is so soft, that they typically fall apart from the pressure required to polished the faces. Stones will always be small, and it takes a masterful gem cutter to produce them. This is one of the very few faceted gems of Vivianite that I've ever seen. It comes from the Herja Mine in Romania, which isn't best known for its Vivianites, but it has produced some very gemmy crystals over the years. The stone came from a crystal mined about 25 years ago. It has a Freeform cut with a rich green color that actually will turn to a blue hue when rotated 90 degrees, showing distinct pleochroism. If you collect rare gems, this is a great opportunity to fill in a hole in your collection with a very rarely seen faceted example of this beautiful iron phosphate.

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Eudialyte (rare) from Poudrette Quarry, Mont Saint-Hilaire, Quebec, Canada [./gems717/eudiacan010a.JPG] Eudialyte (rare) from Poudrette Quarry, Mont Saint-Hilaire, Quebec, Canada [./gems717/eudiacan010b.JPG]

Gemstone # EUDIACAN010
Name: Eudialyte (rare)
Locality: Poudrette Quarry, Mont Saint-Hilaire, Quebec, Canada
Weight: 0.10 carats
Size: 2.98 mm
Price per Carat: $ 450.00 (=~ £ 306.31)
Price For Stone: $ 45.00 (=~ £ 30.63)
      Cut: Trillion
Color: Pink-Red
Clarity: Slightly Included
Cut by Us: No
Availability: Available

Comments:

Eudialyte is very rarely seen in gem quality material. In fact, the most well-known "gem" material is found in Russia, and it's not even transparent. The famous Poudrette Quarry in Mont Saint-Hilaire, Canada has produced beautiful, albeit small, crystals of brilliant pink to red Eudialyte, but they are rarely large enough to produce gemstones. This particular gem is not terribly small in terms of Eudialyte standards, as gems are often below 1 carat in weight. This Trillion Brilliant cut gem has some slight inclusions, but these stones are virtually impossible to find in clean examples. Obviously the photos for this stone are magnified many times over, so the inlcusions look more prominent than they do in person. It shows a wonderfully rich pink-red hue and looks great in any kind of light. Stones like this are virtually impossible to obtain on the market, and if you collect rarities, don't miss out on this attractive little sparkler from one of the most prolific mineral producing localities in the world. A great example of this beautiful cyclosilicate.

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Fahleite (unbelievably rare) from Tsumeb Mine, Otjiokoto Region, Namibia [./gems717/fahltsum020a.JPG] Fahleite (unbelievably rare) from Tsumeb Mine, Otjiokoto Region, Namibia [./gems717/fahltsum020b.JPG]

Gemstone # FAHLTSUM020
Name: Fahleite (unbelievably rare)
Locality: Tsumeb Mine, Otjiokoto Region, Namibia
Weight: 0.20 carats
Size: 4.27 x 3.16 mm
Price per Carat: SOLD
Price For Stone: SOLD
      Cut: Shield
Color: Green
Clarity: Translucent
Cut by Us: No
Availability: sold

Comments:

Fahleite is an unbelievably rare hydrated calcium zinc iron arsenate that is only found in one place in the world, the famous Tsumeb Mine. The species has been known since 1982, but I've never seen an example of it in faceted form. As a matter of fact, I've only seen one other piece of Fahleite in my life. The best specimens are small to be sure, but if you collect rare gems, this is about as rare as it gets. It's been decades since anything has been found, and since Tsumeb is done, there will not be any more of it unless a new locality for the species is discovered. This Shield cut gem has the top color seen in Fahleite, a rich green hue with a silky interior. I've never seen a piece of transparent green Fahleite even in photos, so I firmly believe this is as fine a stone as one could ask for from this incredibly elusive material. It goes without saying that I don't have another one of these for sale, so if you have a rare gem collection, you can't afford to miss out on adding this tremendously hard to find piece to it.

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Montebrasite included with Boulangerite Montebrasite included with Boulangerite

Gemstone # MONTEBRAZ2155A
Name: Montebrasite included with Boulangerite "needles"
Locality: Brazil
Weight: 21.55 carats
Size: 18.13 x 13.49 mm
Price per Carat: $ 15.00 (=~ £ 10.21)
Price For Stone: $ 323.25 (=~ £ 220.04)
      Cut: Emerald
Color: Colorless and Gray
Clarity: Slightly Included to Translucent
Cut by Us: No
Availability: Available

Comments:

Montebrasite is a lesser known analogue of Amblygonite, but it turns out that a large percentage of the material that has been labeled as Amblygonite over the decades is more than likely Montebrasite. Apparently, Montebrasite is the hydroxyl (OH) member of the series, and is FAR more common than Amblygonite which is the fluorine analogue. A number of tests have revealed that the vast majority of the "Amblygonites" in the world are Montebrasite, so keep this in mind when you see the material offered for sale. This would be a very good sized stone of Montebrasite on its own, but it is actually the host for the rare lead antimony sulfosalt Boulangerite which is seen as thin gray "needles" included inside. I've never seen the association before, so I was certainly surprised when I laid eyes upon it. This stone was analyzed by Dr. Jaroslav Hyrsl, who confirmed that the "needles" were in fact Boulangerite. An exceptionally rare and unusual gem for anybody who likes inclusion stones or just oddball pieces.

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Creedite from Akchatau Mine, Akchatau, Karagandy Province, Kazakhstan [./gems717/creedkaz015a.JPG] Creedite from Akchatau Mine, Akchatau, Karagandy Province, Kazakhstan [./gems717/creedkaz015b.JPG]

Gemstone # CREEDKAZ015
Name: Creedite
Locality: Akchatau Mine, Akchatau, Karagandy Province, Kazakhstan
Weight: 0.15 carats
Size: 3.73 x 2.97 mm
Price per Carat: $ 1200.00 (=~ £ 816.84)
Price For Stone: $ 180.00 (=~ £ 122.53)
      Cut: Cut Corner Rectangle
Color: Lilac
Clarity: Very Slightly Included
Cut by Us: No
Availability: Available

Comments: Purple is one of the rarest colors in the gem world (if you eliminate Amethyst). There are few purple gems out there, and Creedite is certainly one of the most elusive, especially in this color. In the early 1990s, a small amount of this uncommon halide species was discovered at the Akchatau Mine in Kazakhstan, and even though few specimens were found, they were some of the finest color examples of the species outside of Santa Eulalia, Mexico. This Cut Corner Rectangle cut stone has a lovely light purple / lilac hue with very slight inclusions, which is much better than the majority of Creedites I've seen over the years. Most Creedites are translucent at best, but this is a GEM QUALITY stone. Regardless of size, it would be a very worthwhile addition for any rare gem collector. If you collect rarities, this is a great opportunity to pick up a stone that is seldom seen on the market, and more than likely will never be found at the Akchatau Mine again.

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Eudialyite (rare) from Poudrette Quarry, Mont Saint-Hilaire, Quebec, Canada [./gems717/eudiacan013a.JPG] Eudialyite (rare) from Poudrette Quarry, Mont Saint-Hilaire, Quebec, Canada [./gems717/eudiacan013b.JPG]

Gemstone # EUDIACAN013
Name: Eudialyite (rare)
Locality: Poudrette Quarry, Mont Saint-Hilaire, Quebec, Canada
Weight: 0.13 carats
Size: 3.43 mm
Price per Carat: $ 700.00 (=~ £ 476.49)
Price For Stone: $ 91.00 (=~ £ 61.94)
      Cut: Round Brilliant
Color: Red (with rich orange overtones)
Clarity: Very Slightly Included
Cut by Us: No
Availability: Available

Comments:

Eudialyte is very rarely seen in gem quality material. In fact, the most well-known "gem" material is found in Russia, and it's not even transparent. The famous Poudrette Quarry in Mont Saint-Hilaire, Canada has produced beautiful, albeit small, crystals of brilliant pink to red Eudialyte, but they are rarely large enough to produce gemstones. This particular gem is not terribly small in terms of Eudialyte standards, as gems are often below 1 carat in weight. This Round Brilliant cut gem has some VERY slight inclusions, but these stones are virtually impossible to find in clean examples. Obviously the photos for this stone are magnified many times over, so the inlcusions look more prominent than they do in person. It shows a wonderfully strong red hue with rich orange overtones, and looks great in any kind of light. Stones like this are virtually impossible to obtain on the market, and if you collect rarities, don't miss out on this attractive little sparkler from one of the most prolific mineral producing localities in the world. A great example of this beautiful cyclosilicate.

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Wurtzite (rare) from Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania [./gems717/wurtztanz040a.JPG] Wurtzite (rare) from Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania [./gems717/wurtztanz040b.JPG]

Gemstone # WURTZTANZ040
Name: Wurtzite (rare)
Locality: Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania
Weight: 0.40 carats
Size: 5.06 x 2.99 mm
Price per Carat: SOLD
Price For Stone: SOLD
      Cut: Rectangle
Color: Reddish Orange
Clarity: Very Very Slightly Included
Cut by Us: No
Availability: sold

Comments:

Wurtzite is the hexagonal dimorph of the better known zinc sulfide, Sphalerite. The species was named after Charles Adolphe Wurtz a Frenchman who was one of the most influential chemists in the world. He received many honors in his lifetime and his is one of 72 scientists, mathematicians, and engineers whose name is on the Eifel Tower. Typically Wurtzite is found in either opaque or nearly microscopic crystals, so faceting gemstones is nearly impossible. At the end of 2012, a single pocket of what is considered to be the finest discovery of the species known took place in one of the most unlikely of localities, the Merelani Hills of Tanzania which are the home of the world famous Tanzanite crystals and gems. This discovery was not only surprising, but it yielded some superb crystallized examples of Wurtzite with a strong reddish-orange hue. Even though Wurtzite is reported as occurring in a wide range of colors from red to green with browns, yellow and oranges in between, these particular specimens from Tanzania are arguably the finest color considering their larger size. This stone is a superb and incredibly hard to find example of faceted Wurtzite. It has a Rectangle cut with nearly eye clean clarity (only tiny inclusions can be seen under magnification) and a gorgeous semi-metallic looking reddish-orange hue. This is a bright gem and very attractive for the species. More than likely these will never be found again, and certainly would make a superb addition to a rare stone suite. It's also one of the few transparent sulfides in the world, and should be greatly appreciated on that basis alone.

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Thomas Range, Juab County, Utah from Thomas Range, Juab County, Utah [./gems717/bixutah073a.JPG] Thomas Range, Juab County, Utah from Thomas Range, Juab County, Utah [./gems717/bixutah073b.JPG]

Gemstone # BIXUTAH073
Name: Thomas Range, Juab County, Utah
Locality: Thomas Range, Juab County, Utah
Weight: 0.73 carats
Size: 4.85 x 4.60 mm
Price per Carat: $ 123.29 (=~ £ 83.92)
Price For Stone: $ 90.00 (=~ £ 61.26)
      Cut: Trapezoid
Color: Black
Clarity: Opaque
Cut by Us: No
Availability: Available

Comments: Bixbyite is best known from the Thomas Range in Juab County, Utah where it was first discovered by Maynard Bixby in the 1800s. The material is not often faceted into stones, partially due to the fact that it's black and opaque, but crystals are not terribly big, so the gems are usually less than 1 carat in weight. This Trapezoid cut gem is a nice example of faceted Bixbyite with a metallic black appearance. A great gem to add to a rare stone suite or a collection of gems from the United States.

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Spurrite (rare) from Fuka Mine, Fuka, Bicchu-cho, Takahashi City, Okayama Prefecture, Chugoku Region, Honshu Island, Japan [./gems717/spurrjapan300a.JPG] Spurrite (rare) from Fuka Mine, Fuka, Bicchu-cho, Takahashi City, Okayama Prefecture, Chugoku Region, Honshu Island, Japan [./gems717/spurrjapan300b.JPG]

Gemstone # SPURRJAPAN300
Name: Spurrite (rare)
Locality: Fuka Mine, Fuka, Bicchu-cho, Takahashi City, Okayama Prefecture, Chugoku Region, Honshu Island, Japan
Weight: 3.00 carats
Size: 9.85 x 8.05 mm
Price per Carat: $ 50.00 (=~ £ 34.03)
Price For Stone: $ 150.00 (=~ £ 102.10)
      Cut: Oval
Color: Purple and White
Clarity: Slightly Translucent
Cut by Us: No
Availability: Available

Comments:

Spurrite is a rare calcium silicate carbonate that is found in grey, blue and purple examples from various localities around the world. The species was named after Josiah Edward Spurr in 1908. Spurr actually had a crater of the moon in the midst of the Palus Putredinis plain named in his honor. Arguably, some of the best purple colored Spurrite in the world is found at the Fuka Mine in Japan. I've only seen a few examples of this material in specimen form, and never have I had a faceted example to offer for sale. This Oval cut stone is a lovely purple gem with white streaks of Spurrite weighing in at exactly 3.00 carats. A great rarity to be sure, and if you collect oddball gems or hard to find material like this, don't miss out on this notably rare faceted example from a lesser known locality.

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Chromium-bearing Titanite (Chrome Sphene) from Saranovskii Mine (Saranovskoe), Saranovskaya Village (Sarany), Gornozavodskii area, Permskaya Oblast', Middle Urals, Urals Region, Russia [./gems717/chtitanrus003a.JPG] Chromium-bearing Titanite (Chrome Sphene) from Saranovskii Mine (Saranovskoe), Saranovskaya Village (Sarany), Gornozavodskii area, Permskaya Oblast', Middle Urals, Urals Region, Russia [./gems717/chtitanrus003b.JPG]

Gemstone # CHTITANRUS003
Name: Chromium-bearing Titanite (Chrome Sphene)
Locality: Saranovskii Mine (Saranovskoe), Saranovskaya Village (Sarany), Gornozavodskii area, Permskaya Oblast', Middle Urals, Urals Region, Russia
Weight: 0.03 carats
Size: 1.98 mm
Price per Carat: SOLD
Price For Stone: SOLD
      Cut: Round Brilliant
Color: Rich Green
Clarity: Nearly Eye Clean
Cut by Us: No
Availability: sold

Comments:

During the mid 1990s there was a discovery of some of the finest green chromium-bearing Titanite (chrome Sphene) in the world at the famous Chromite Mine at Saranovskaya Village in the Ural Mountains of Russia. These crystals are certainly the finest colored Titanites in the world with the strongest electric green hue seen in the species. Very few specimens were found, and most of them were opaque, but a handful were gemmy enough to yield some impressive gemstones. Titanite is already a beloved stone in the gem world as the high refractive index allows for some brilliant examples to be faceted, but when you combine it with an intense green color, the results are amazing. This stone is small to be sure, but it certainly looks beautiful in person, and as you can see from the photos, it's nearly eye clean, with only the smallest bit of inclusions that can really only be seen with magnification. A great example of this beloved and hard to find material from Russia.

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Nuummite (incredibly rare) from Nuummite localities, Nuuk, Sermersooq, Greenland [./gems717/nuumgreen453a.JPG]

Gemstone # NUUMGREEN453
Name: Nuummite (incredibly rare)
Locality: Nuummite localities, Nuuk, Sermersooq, Greenland
Weight: 4.53 carats
Size: 12.58 x 9.58 mm
Price per Carat: $ 30.00 (=~ £ 20.42)
Price For Stone: $ 135.90 (=~ £ 92.51)
      Cut: Oval Cabochon
Color: Iridescent Blue and Black
Clarity: Opaque
Cut by Us: No
Availability: Available

Comments:

Nuummite is an unapproved name for a metamorphic rock with iridescent amphiboles (Anthophyllite-Gedrite Series), the material is sometimes cut and polished as a gemstone. In Greenlanic, the word Nuummite means "derived from Nuuk". It was the word that was designated for the rock type that was discovered close to Nuuk. Now a company that is owned by the commune of Nuuk manufactures and sells the material exclusively. There is only one other reported locality for the material in the world, but if you see Nuummite on the market, odds are that it came from Greenland. This stone is a lovely Nuummite with a standard "Oval Cabochon" cut and classic banded / striped iridescent blue and black appearance. These gems are rare on the market, and if you collect oddities, you can't afford to miss out on this attractive and obscure gem that is truly only available from one place in the world.

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Charlesite (very rare) from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa [./gems717/charlessa015a.JPG] Charlesite (very rare) from N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa [./gems717/charlessa015b.JPG]

Gemstone # CHARLESSA015
Name: Charlesite (very rare)
Locality: N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa
Weight: 0.15 carats
Size: 5.30 x 4.09 mm
Price per Carat: SOLD
Price For Stone: SOLD
      Cut: Cut Corner Triangle
Color: Yellow (with a green overtone)
Clarity: Translucent
Cut by Us: No
Availability: sold

Comments:

Charlesite was named in 1983 after Charles Palache, the famed mineralogy professor at Harvard University and expert on the minerals of Franklin, New Jersey. The type locality for Charlesite is actually the Frankline Mine, but the most famous specimens are those from the N'Chwaning Mines in South Africa. This complex hydrated compound boro hydroxy sulfate is only found in less than 10 localities in the world. The best of these specimens show an amazing yellow color with beautiful translucency / gemminess. Faceted stones of Charlesite are very rare on the market, and this stone is the only example that I've had to offer for sale, though I have seen a few others at shows over the years. Charlesite is often confused with Ettringite, but this piece was analyzed and confirmed by Dr. Jaroslav Hyrsl and is one of the finest faceted stones of Charlesite that I have seen. This Cut Corner Triangle cut stone shows a glowing yellow hue with a slight green overtone and an above average translucency / gemminess. If you collect rare gems, you can't afford to miss out on this attractive and very hard to find example for your collection.

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Wurtzite (rare) from Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania [./gems717/wurtztanz139a.JPG] Wurtzite (rare) from Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania [./gems717/wurtztanz139b.JPG] Wurtzite (rare) from Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania [./gems717/wurtztanz139c.JPG]

Gemstone # WURTZTANZ139
Name: Wurtzite (rare)
Locality: Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania
Weight: 1.39 carats
Size: 7.28 x 6.49 mm
Price per Carat: $ 250.00 (=~ £ 170.17)
Price For Stone: $ 347.50 (=~ £ 236.54)
      Cut: Modified Step Shield
Color: Dark Reddish Orange
Clarity: Very Very Slightly Included
Cut by Us: No
Availability: Available

Comments:

Wurtzite is a the hexagonal dimorph of the better known zinc sulfide, Sphalerite. The species was named after Charles Adolphe Wurtz a Frenchman who was one of the most influential chemists in the world. He received many honors in his lifetime and he is one of 72 scientists, mathematicians, and engineers whose name is on the Eifel Tower. Typically Wurtzite is found in either opaque or nearly microscopic crystals, so faceting gemstones is nearly impossible. At the end of 2012, a single pocket of what is considered to be the finest discovery of the species known took place in one of the most unlikely of localities, the Merelani Hills of Tanzania which are the home of the world famous Tanzanite crystals and gems. This discovery was not only surprising, but it yielded some superb crystallized examples of Wurtzite with a strong reddish-orange hue. Even though Wurtzite is reported as occurring in wide range of colors from red to green with browns, yellow and oranges in between, these particular specimens from Tanzania are arguably the finest color considering their larger size. This stone is a wonderful and incredibly hard to find example of faceted Wurtzite. It has a Modified Step Shield cut with only very, very slight inclusions and a gorgeous semi-metallic looking dark reddish-orange hue when strongly lit. This is a darker gem, but very large for the species and due to the density, it weighs well over 1 carat. More than likely these will never be found again, and certainly would make a superb addition to a rare stone suite. It's also one of the few transparent sulfides in the world, and should be greatly appreciated on that basis alone.

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Titanite from Pakistan [./gems717/titanitepak363a.JPG] Titanite from Pakistan [./gems717/titanitepak363b.JPG]

Gemstone # TITANITEPAK363
Name: Titanite
Locality: Pakistan
Weight: 3.63 carats
Size: 11.04 x 8.02 mm
Price per Carat: SOLD
Price For Stone: SOLD
      Cut: Oval Brilliant
Color: Golden-yellow
Clarity: Very Very Slight Included
Cut by Us: No
Availability: sold

Comments:

Sometimes this species is referred to as "Sphene" but it is an archaic term, although both are generally accepted in the gem and mineral world. It seems to me that more often it is referred to as "Sphene" in the gem world and Titanite is used for crystallized specimens. One of the great aspects of faceted Titanite is the incredibly high dispersion of the material, which this stone has in spades !! This gem is a bright, beautiful golden color, very, very slightly included Oval Briliant cut gem, but the most interesting aspect is the fact that it shows amazingly high dispersion when rotated in the light (best viewed in sunlight). The photos do not do this stone justice as it shows bright red, green and orange flashes which dance all over the stone. This is one of the few Pakistani Titanites that we've had to offer, and certainly one of the largest / cleaner stones that we've had as well. It would make a great addition to any collection.

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Benitoite (rare) from Dallas Gem Mine (Gem Mine), San Benito County, California [./gems717/benitoca031a.JPG] Benitoite (rare) from Dallas Gem Mine (Gem Mine), San Benito County, California [./gems717/benitoca031b.JPG]

Gemstone # BENITOCA031
Name: Benitoite (rare)
Locality: Dallas Gem Mine (Gem Mine), San Benito County, California
Weight: 0.31 carats
Size: 4.07 mm
Price per Carat: $ 650.00 (=~ £ 442.45)
Price For Stone: $ 201.50 (=~ £ 137.16)
      Cut: Round Brilliant
Color: Cornflower Blue
Clarity: Very Slightly Included
Cut by Us: No
Availability: Available

Comments:

Benitoite is one of the most popular rare gems around due to its vivid color and the fact that it was only found at one locality in any significance. The great Benitoite mine is now completely defunct for all intents and purposes, and will never produce these stones again. This rare barium titanium silicate is actually the state gem of California, and the price of fine gems has been on the rise since the demand is still quite high. Gem dealers in the United States have told us that Benitoite is the most difficult gem for them to keep in stock, everything sells immediately. This is partially due to the fact that in the last few years, collectors have been buying U.S. gemstones in large quantities, and most gems from this country are disappearing fast. This stone has a lively blue color with a slight purple overtone (sometimes referred to as "cornflower blue") and a fine Round Brilliant cut. It's only very slightly included, and don't let the photos fool you, it looks better in person. For the samller size, it really has good saturation of color, and would make for a lovely piece of jewelry or to be left alone as an addition to your rare gem collection.

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Tourmaline (bi-color cat's eye) from Minas Gerais, Brazil [./gems717/tourmcebraz609a.JPG]

Gemstone # TOURMCEBRAZ609
Name: Tourmaline (bi-color cat's eye)
Locality: Minas Gerais, Brazil
Weight: 6.09 carats
Size: 10.48 x 8.90 mm
Price per Carat: $ 75.00 (=~ £ 51.05)
Price For Stone: $ 456.75 (=~ £ 310.91)
      Cut: Oval Cabochon
Color: Pink and Green Bi-Color
Clarity: Translucent
Cut by Us: No
Availability: Available

Comments:

Here is something that truly isn't as common as one might think. Tourmalines come in virtually every color and have some of the most vivid and rich pinks, greens and blues of any gems out there. Cat's Eye stones are created by orienting the stone perpendicular to the tiny fibrous inclusions inside which in turn reflect the light causing an "eye" to appear. Now we've all seen plenty of bi-color Tourmalines, and our share of Cat's Eye Tourmalines, but one of the rarest things I've seen in Tourmalines is a true bi-color Cat's Eye stone! This gem is a rich green and pink color Oval Cabochon gem with a visible, "eye" running the length of the stone on the green side. PLEASE NOTE: The "eye" shows up very well when a strong pen light is shone directly at the stone. I apologize as it was difficult to get the "eye" to show up well in the photo, but it looks great in person. A very rare, attractive, colorful and unique collector's stone of this beloved material from Brazil.

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Spessartine from Little Three Mine, Ramona, San Diego County, California [./gems717/spessca105a.JPG] Spessartine from Little Three Mine, Ramona, San Diego County, California [./gems717/spessca105b.JPG]

Gemstone # SPESSCA105
Name: Spessartine
Locality: Little Three Mine, Ramona, San Diego County, California
Weight: 1.05 carats
Size: 5.85 mm
Price per Carat: $ 500.00 (=~ £ 340.35)
Price For Stone: $ 525.00 (=~ £ 357.37)
      Cut: Round Brilliant
Color: Bright Orange
Clarity: Very Slightly Included
Cut by Us: No
Availability: Available

Comments:

In the gem world, Garnet comes in every color of the rainbow except blue. Some of the best orange Garnets in the world are those from the famous Little Three Mine in San Diego County, California. This locality is permanently closed, and will never produce these amazing gems again. These are certainly some of the best orange color Garnet ever found, and arguably the best from North America with regard to the color. This stone is a very good quality, saturated, very slightly included bright orange color gemstone with a Round Brilliant cut. This material is almost totally pure in manganese and has very little iron content, which is why the stone is so orange and not red. This gem could be called what is being marketed as "Mandarin Garnet" because of the intense orange color. This stone came to us from the personal collection of Bill Larson, and was priced at $840.00 retail, so this is a great opportunity to pick up a fine natural gemstone from the U.S. for a rock bottom price! Dealers and collectors have reported that there is a fervor for gemstones from the United States, and nearly everything from U.S. localities is getting scooped up as fast as it becomes avaialable. Things like Hiddenite from North Carolina, Red Beryl from Utah, Benitoite from California, Sapphire from Montana and Rhodochrosite from the Sweet Home Mine in Colorado are among the leaders for the most popular U.S. gems out there, and Spessartines from the Little Three Mine are certainly on the short list for sought after gems for collectors.

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Sapphire (Multiple Color Change!) Blue (with green overtone) to Orange (with pink overtone) to Purplish-pink from Tunduru, Tanzania [./gems717/sapphtanz157a.jpg] Sapphire (Multiple Color Change!) Blue (with green overtone) to Orange (with pink overtone) to Purplish-pink from Tunduru, Tanzania [./gems717/sapphtanz157b.jpg] Sapphire (Multiple Color Change!) Blue (with green overtone) to Orange (with pink overtone) to Purplish-pink from Tunduru, Tanzania [./gems717/sapphtanz157c.JPG] Sapphire (Multiple Color Change!) Blue (with green overtone) to Orange (with pink overtone) to Purplish-pink from Tunduru, Tanzania [./gems717/sapphtanz157d.JPG] Sapphire (Multiple Color Change!) Blue (with green overtone) to Orange (with pink overtone) to Purplish-pink from Tunduru, Tanzania [./gems717/sapphtanz157e.JPG] Sapphire (Multiple Color Change!) Blue (with green overtone) to Orange (with pink overtone) to Purplish-pink from Tunduru, Tanzania [./gems717/sapphtanz157f.JPG]

Gemstone # SAPPTANZ157
Name: Sapphire (Multiple Color Change!) Blue (with green overtone) to Orange (with pink overtone) to Purplish-pink
Locality: Tunduru, Tanzania
Weight: 1.57 carats
Size: 7.54 x 5.72 mm
Price per Carat: SOLD
Price For Stone: SOLD
      Cut: Oval
Color: Multiple Color Change
Clarity: Very Slightly Inlcuded
Cut by Us: No
Availability: sold

Comments:

The Tunduru District of Tanzania has produced some of the most impressive and colorful Sapphire gems extant. I have seen Sapphires of every color of the rainbow from Tunduru, and this stone is a great example of said material. This gem has a really interesting appearance as it shows a myriad of different colors depending upon the light under which it's view. If you use a cool temperature LED light, you will see a blue color with slight green overtones. A warmer toned LED light will produce an orange hue with slight pink overtones. Additionally, I looked at the gem under a halogen light, and it's a purplish color with pink flashes. We also found a old incandescent flashlight and the stone turned GREEN. Essentially, the color of the gem will change with virtually every temperature of light under which it's viewed. This goes BEYOND an "Alexandrite"-type color change, as those stones typically only show TWO different colors, and this one shows at least FOUR that we've seen. The gem is very slightly included and has an Oval Step cut. It would make a great addition to any suite of Sapphire gems, especially if you've been looking for that perfect gemstone to fill a spot in your collection to show the great range of color for Sapphire.

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Rhodochrosite from N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa [./gems717/rhodosa051a.JPG] Rhodochrosite from N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa [./gems717/rhodosa051b.JPG]

Gemstone # RHODOSA051
Name: Rhodochrosite
Locality: N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa
Weight: 0.51 carats
Size: 5.00 x 3.30 mm
Price per Carat: $ 300.00 (=~ £ 204.21)
Price For Stone: $ 153.00 (=~ £ 104.15)
      Cut: Rectangle
Color: Red-orange
Clarity: Very Very Slightly Included
Cut by Us: No
Availability: Available

Comments:

The various Manganese deposits in South Africa have provided a tremendous amount of Rhodochrosite with a beautiful red color, but gems are becoming very difficult to obtain these days. With that said, this Rectangle cut gem is one of the better stones of Rhodo from South Afrcia that I have had to offer in a while. The stone has very, very slight inclusions, but the color is a beautiful red-orange with unusual "banding" that can be seen on one side. This is a highly attractive stone for this material, and these specimens are no longer being mined. Don't miss out on this little beauty.

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Bustamite (rare) from Wessels Mine, Hotazel, Kalahari manganese field, Northern Cape Province, South Africa [./gems717/bustamitesa111a.JPG] Bustamite (rare) from Wessels Mine, Hotazel, Kalahari manganese field, Northern Cape Province, South Africa [./gems717/bustamitesa111b.JPG]

Gemstone # BUSTAMITESA111
Name: Bustamite (rare)
Locality: Wessels Mine, Hotazel, Kalahari manganese field, Northern Cape Province, South Africa
Weight: 1.11 carats
Size: 7.90 x 5.18 mm
Price per Carat: $ 200.00 (=~ £ 136.14)
Price For Stone: $ 222.00 (=~ £ 151.12)
      Cut: Octagaon
Color: Pinkish-orange
Clarity: Translucent
Cut by Us: No
Availability: Available

Comments: Bustamite is a rare manganese calcium silicate, and the specimens from South Africa are sought after for their lapidary value. Typically the South African Bustamites are pink, but this stone has a noticeable orange hue, and is certainly more translucent than many other Bustamites I have seen (most are closer to opaque). This Octagon cut gem really glows in the sunlight like a pastel color Rhodochrosite. This is the first Bustamite stone that I have had to offer for sale in years, so don't miss out. A great gem to add to rare stone suite or a collection of South African gems.

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Rhodochrosite (Cat's Eye) from Kounrad Massif, Balkhash, Balkhash Region, Karagandy Province, Kazakhstan [./gems717/rhodocekaz206a.JPG] Rhodochrosite (Cat's Eye) from Kounrad Massif, Balkhash, Balkhash Region, Karagandy Province, Kazakhstan [./gems717/rhodocekaz206b.JPG]

Gemstone # RHODOCEKAZ206
Name: Rhodochrosite (Cat's Eye)
Locality: Kounrad Massif, Balkhash, Balkhash Region, Karagandy Province, Kazakhstan
Weight: 2.06 carats
Size: 7.57 mm
Price per Carat: $ 150.00 (=~ £ 102.10)
Price For Stone: $ 309.00 (=~ £ 210.34)
      Cut: Round Cabochon
Color: Orange-pink
Clarity: Translucent
Cut by Us: No
Availability: Available

Comments:

Rhodochrosite is not terribly common in gem quality material, and if you eliminate a few mines in Colorado, South Africa and the Uchucchacua Mine in Peru, there are few places left in the world where good stones can be found. There are some specimens from Kazakhstan, that might not be considered top gem quality, but they are certainly gemmy, and in the case of this stone, can show a rare Cat's Eye effect that is not seen in more well-known Rhodochrosite localities. I honestly did a double take when I first saw this stone, as I don't think I've ever encountered another one like it, certainly not from Kazakhstan. This Round Cabochon cut gem has a medium orange-pink color wih moderate gemminess / good translucency, but the most important aspect is that when you shine a strong light on it, you can clearly see a Cat's Eye appear (best seen in the first photo on the right edge of the stone). Now this isn't the world finest example of a Cat's Eye gem, but have you ever seen a Rhodochrosite that showed a Cat's Eye like this? I know there are a lot of people who love Rhodochrosite, and gems like this are nearly impossible to obtain, especially since it was mined in the late 1980s / early 1990s and will probably never be available on the market again. Don't miss out on this one if you want to fill a hole in your collection, as I will probably never have another one like it again.

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Schlossmacherite with Ceruleite (very rare) from Emma Luisa Mine, Guanaco, Chile (Type Locality for BOTH species) [./gems717/schlosschile066a.JPG] Schlossmacherite with Ceruleite (very rare) from Emma Luisa Mine, Guanaco, Chile (Type Locality for BOTH species) [./gems717/schlosschile066b.JPG]

Gemstone # SCHLOSSCHILE066
Name: Schlossmacherite with Ceruleite (very rare)
Locality: Emma Luisa Mine, Guanaco, Chile (Type Locality for BOTH species)
Weight: 0.66 carats
Size: 7.75 x 6.10 mm
Price per Carat: $ 250.00 (=~ £ 170.17)
Price For Stone: $ 165.00 (=~ £ 112.32)
      Cut: Triangle
Color: Sage Green and Sky Blue
Clarity: Translucent to Opaque
Cut by Us: No
Availability: Available

Comments:

Here's a great one for you rare stone collectors! This gem is from the type locality for Schlossmacherite AND Ceruleite, the Emma Luisa Mine in Chile (it's the ONLY known locality for Schlossmacherite). This Triangle cut stone features a large green section of the rare sulfate Schlossmacherite with a sky blue area of the slightly less rare sulfate Ceruleite. Obviously, Ceruleite gets its name for caeruleus (the Latin word meaning "of or pertaining to the sky") and Schlossmacherite is named for Karl Schlossmacher, the honorary president of the German Gemmological Society. I don't know how many of these gems are out there, but this is one of only TWO stones I've had of this material to offer for sale. If you collect rarities, especially colorful rarities, don't miss out on this unique and very hard to find gem from Chile.

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Sphalerite from Septemvri mine, Madan Ore Field, Rhodope Mts, Smolyan Oblast, Bulgaria [./gems717/sphalbulg173a.JPG] Sphalerite from Septemvri mine, Madan Ore Field, Rhodope Mts, Smolyan Oblast, Bulgaria [./gems717/sphalbulg173b.JPG]

Gemstone # SPHALBULG173
Name: Sphalerite
Locality: Septemvri mine, Madan Ore Field, Rhodope Mts, Smolyan Oblast, Bulgaria
Weight: 1.73 carats
Size: 7.66 mm
Price per Carat: $ 150.00 (=~ £ 102.10)
Price For Stone: $ 259.50 (=~ £ 176.64)
      Cut: Mumble Brilliant
Color: Green
Clarity: Very very slightly included
Cut by Us: yes
Availability: Available

Comments:

Gem quality Sphalerite is found around the world in virtually every color of the rainbow exept for blue and purple. Arguably the finest GREEN Sphalerites are those from the Madan Ore Field in Bulgaria. This area has produced some of the world's most intense green gems, with larger stones and excellent clarity. This particular stone was cut by Allyce Kosnar of Kosnar Gem Co in August of 2017 and shows a rich green hue that is highlighted by flashes of yellow, blue-green, gold and orange. Due to the high refractive index of Sphalerite, the material will dance with color under strong lighting. This stone probably looks best in direct sunlight, but any strong light will show off the color well. My favorite aspect of the stone is that it shows the highly sought after CHROME GREEN color that is virtually unseen in Sphalerite. It's so green that it actually has a blue tinge to it, if that makes sense. This is the finest hue for Sphalerite from any world locality, and this gem is LOADED with it! It was a difficult stone to photograph, and I really think it looks better in person. A fantastic, brilliant collector quality gem with a custom cut from this famous ore deposit in Bulgaria.

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Smithsonite (Cadmium-bearing) from Masua mine, Sardinia, Italy [./gems717/smithitaly2833a.JPG] Smithsonite (Cadmium-bearing) from Masua mine, Sardinia, Italy [./gems717/smithitaly2833b.JPG] Smithsonite (Cadmium-bearing) from Masua mine, Sardinia, Italy [./gems717/smithitaly2833c.JPG]

Gemstone # SMITHITALY2833
Name: Smithsonite (Cadmium-bearing)
Locality: Masua mine, Sardinia, Italy
Weight: 28.33 carats
Size: 35.7 x 12.9 mm
Price per Carat: SOLD
Price For Stone: SOLD
      Cut: Freeform Cabochon -cut by William Kosnar
Color: Yellow with tan banding
Clarity: N/A
Cut by Us: yes
Availability: sold

Comments:

The Masua mine in Sardinia, Italy has produced some of the most impressive and eye-catching yellow Smithsonite from any locality. This material is Cadmian Smithsonite, which contributes to the brilliant hue. This stone is a wonderful, bright lemon yellow colored stone with a "Freeform Cabochon" cut that was cut and polished by our son William Kosnar (age 16). We're very proud to offer the first stone that William cut and polished himself for sale. The gem itself is translucent, but I have never seen completely transparent stones from this locailty. What really makes this one stand out from other stones we've had in the past is that it shows defined concentric banding / "rings" throughout. As a matter of fact, I have only seen a handful of these gems in my life, and yellow stones are certainly hard to come by, especially anything that comes close to the intensity of this stone. One corner of the gem has a bit of a tan hue, which is probably from a bit of iron content instead of cadmium. The gem looks good in the photos, but even better in person. A wonderful opportunity for a collector to snag this attractive and rarely seen gem for a great price.

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