RARE COLLECTOR GEMSTONES

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GEMSPIN-7 - Spinel - $ 2900
Ipanko, Mahenge, Morogoro Region, Tanzania

thumbnail, 1.2 x 0.8 x 0.4 cm; 3.56 ct
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Spinel from Ipanko, Mahenge, Morogoro Region, Tanzania [db_pics/new2010/STP7a.jpg]


GEMSPIN-6 - Spinel - $ 1600
Ipanko, Mahenge, Morogoro Region, Tanzania

thumbnail, 1.0 x 0.7 x 0.5 cm; 3.15 ct
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Spinel from Ipanko, Mahenge, Morogoro Region, Tanzania [db_pics/new2010/STP6a.jpg]


GEMSPIN-5 - Spinel - $ 1700
Ipanko, Mahenge, Morogoro Region, Tanzania

thumbnail, 1.0 x 0.7 x 0.6 cm; 2.96 ct
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Spinel from Ipanko, Mahenge, Morogoro Region, Tanzania [db_pics/new2010/STP5a.jpg]


GEMSPIN-4 - Spinel - $ 1150
Ipanko, Mahenge, Morogoro Region, Tanzania

thumbnail, 0.9 x 0.9 x 0.6 cm; 2.14 ct
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Spinel from Ipanko, Mahenge, Morogoro Region, Tanzania [db_pics/new2010/STP4a.jpg]


GEMSPIN-3 - Spinel - $ 4800
Ipanko, Mahenge, Morogoro Region, Tanzania

thumbnail, 1.2 x 1.0 x 0.6 cm; 5.84 ct
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Spinel from Ipanko, Mahenge, Morogoro Region, Tanzania [db_pics/new2010/STP3a.jpg]


GEMSPIN-2 - Spinel - $ 4200
Ipanko, Mahenge, Morogoro Region, Tanzania

thumbnail, 1.3 x 0.8 x 0.5 cm; 4.61 ct
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Spinel from Ipanko, Mahenge, Morogoro Region, Tanzania [db_pics/new2010/STP2a.jpg]


GEMSPIN-1 - Spinel - $ 3750
Ipanko, Mahenge, Morogoro Region, Tanzania

thumbnail, 1.1 x 0.9 x 0.6 cm; 4.43 ct
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Spinel from Ipanko, Mahenge, Morogoro Region, Tanzania [db_pics/new2010/STP1a.jpg]


GEMS-029 - Calcite - $ 50
Brazil

thumbnail, 11.14 x 7.09 mm ; 2.67 carats
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Calcite from Brazil [db_pics/new09/rlkg029a.JPG]
Calcite from Brazil [db_pics/new09/rlkg029b.JPG]Calcite from Brazil [db_pics/new09/rlkg029c.JPG]

Though Calcite is the most abundant carbonate in the earth's crust, and is known to every collector in a variety of colors and forms, it is not a very common gem because the material has perfect cleavage plane running in 3 directions, so only very skilled faceters can create well cut gems. This particular stone is a nice light yellow color, very slightly included gem with an Emerald cut. Due to the birefringence of Calcite, the pictures make the stone look a bit fuzzy, but it looks better in person.


GEMS-037 - Hessonite Garnet - $ 1100
Tanzania

thumbnail, 13.00 mm ; 10.68 carats
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Hessonite Garnet from Tanzania [db_pics/new09/rlkg037a.JPG]
Hessonite Garnet from Tanzania [db_pics/new09/rlkg037b.JPG]Hessonite Garnet from Tanzania [db_pics/new09/rlkg037c.JPG]

Hessonite Garnets are some of the most vivid and beautiful gems in the Garnet family. These stones are beloved for their great color and large size stones. Garnets are generally very difficult to find in stones over 4 or 5 carats because the material simply does not often form large, gemmy sections that produce big stones. This gem is really impressive with a rich red color (with a slight orange overtone) and an attractive Flower Round Brilliant cut, but the greatest aspect of this stone is the sheer size! It is very difficult to find a gem of this quality with this color over 10 carats. They are truly few and far between in this size range. The stone is virtually eye clean and the color amazingly very rich. A great opportunity for a Garnet to collector to add a significant gem to their collection.


GEMS-028 - Clinohumite - $ 600
Tajikistan

thumbnail, 9.55 x 7.85 mm ; 3.00 carats
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Clinohumite from Tajikistan [db_pics/new09/rlkg028a.JPG]
Clinohumite from Tajikistan [db_pics/new09/rlkg028c.JPG]Clinohumite from Tajikistan [db_pics/new09/rlkg028d.JPG]

Clinohumite is a relatively uncommon silicate that RARELY forms gemmy enough crystals with good color for faceting. Recently there was a find of some of the most spectacular Clinohumite crystals in the Pamir Mountains of Tajikistan. These crystals were of a vivid color and excellent gem clarity. Many of crystals were cut into stones and set a new standard for the species as a cut gem. This particular stone is a stunning, bright orange color gem that is only slightly included and has an Oval Brilliant cut. This material is extremely difficult to find now as the locality seems to be exhausted and the best stones are long gone.


GEMS-027 - Pezzottaite (cut by Brett Kosnar) - $ 950
Sakavalana mine, Madagascar

thumbnail, 8.21 x 5.40 mm ; 1.39 carats
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Pezzottaite (cut by Brett Kosnar) from Sakavalana mine, Madagascar [db_pics/new09/rlkg027a.JPG]
Pezzottaite (cut by Brett Kosnar) from Sakavalana mine, Madagascar [db_pics/new09/rlkg027e.JPG]Pezzottaite (cut by Brett Kosnar) from Sakavalana mine, Madagascar [db_pics/new09/rlkg027c.JPG]

Pezzottaite is one of the great new gem discoveries of the last 20 years. It is a Cesium bearing Beryl species discovered in Madagascar a few years ago, and is only found in two localities in the world. It is definitely one of the most rare and beautiful gems on the market today regardless of the rarity. It is actually one of the great combinations of rarity and beauty that puts it into an elite category of gems. This material was originally thought to be a variety of Beryl, but now stands as its own species. This material has one of the most unique colors in the gem world with a very rich, intense, distinctive pink which truly doesn't resemble any other gem. This is a beautiful stone with a lively rich pink color and an Emerald cut. This gem has obvious inclusions (like most stones over 1 carat), but does have clean gem areas. The supply of Pezzottaite seems to have dwindled to virtually nothing in the past year or so, and the price of the top stones is on the rise. A great rare gem for any collector. This stone was cut by Brett Kosnar.


GEMS-025 - Moldavite - $ 750
Czech Republic

thumbnail, 18.0 x 13.5 mm ; 9.63 carats
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Moldavite from Czech Republic [db_pics/new09/rlkg025a.JPG]
Moldavite from Czech Republic [db_pics/new09/rlkg025b.JPG]Moldavite from Czech Republic [db_pics/new09/rlkg025c.JPG]

Moldavite is often referred to as the gem that fell to earth. This material is believed to have formed when a shower of meteorites fell in what is now the Czech Republic within a one hundred mile area around the Vltava River, which was once called the Moldau, and from which Moldavite gets its name. These stones are actually tektites and Moldavite is a one-of-a-kind tektite. There are many theories where Moldavite originated and the inability of science to resolve the issues with one conclusive explanation of the true origins of Moldavite causes it to remain one of the great mysteries of the gem world. Nonetheless, Moldavite isn't often faceted into gems (usually it is left in it's original form or used for carvings - plus the very unusual form of the rough stones doesn't make for very good yield when it comes to cutting stones), and this is a VERY good size stone for this material. The stone has an Oval cut and is one of the larger Moldavites I've seen in a long time. There are some very slight bubble inclusions, but it's a unique stone and not often seen in this size on the market.


GEMS-022 - Sillimanite - $ 200
Sri Lanka

thumbnail, 8.6 x 5.0 mm ; 1.03 carats
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Sillimanite from Sri Lanka [db_pics/new09/rlkg022a.JPG]
Sillimanite from Sri Lanka [db_pics/new09/rlkg022b.JPG]Sillimanite from Sri Lanka [db_pics/new09/rlkg022c.JPG]

Sillimanite is sometimes called "Fibrolite" because of the fibrous nature of the material. This is actually pretty rare material, and considering the clarity and color of this particular stone, it's a significant gem. In my experience Sillimanite stones are often very pale in color, almost appearing colorless. Most gems you see on the market are some light shade of blue, green or purple. This stone has a great greenish-yellow color with an "Oval Brilliant" cut and it is only very slightly included.


GEMS-015 - Titanite (Sphene) from MEXICO - $ 325
Baja California, Mexico

thumbnail, 8.4 x 7.6 mm ; 3.27 carats
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Titanite (Sphene) from MEXICO from Baja California, Mexico [db_pics/new09/rlkg015b.JPG]
Titanite (Sphene) from MEXICO from Baja California, Mexico [db_pics/new09/rlkg015c.JPG]Titanite (Sphene) from MEXICO from Baja California, Mexico [db_pics/new09/rlkg015d.JPG]

Sometimes this species is referred to as "Sphene" but it is an outdated name and the correct name is Titanite though both are 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 high dispersion of the material. This gem has a deep greenish-golden color, and is a good sized stone for this material. The stone has a Square Emerald cut and is only very slightly included.


GEMS-004 - Scheelite - $ 300
Khapalu, Pakistan

thumbnail, 6.7 x 6.3 mm ; 1.83 carats
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Scheelite from Khapalu, Pakistan [db_pics/new09/rlkg004a.JPG]Scheelite from Khapalu, Pakistan [db_pics/new09/rlkg004b.JPG]
Scheelite from Khapalu, Pakistan [db_pics/new09/rlkg004c.JPG]Scheelite from Khapalu, Pakistan [db_pics/new09/rlkg004d.JPG]

Scheelite can be some of the most beautiful among the less common gems. The high refractive index allows for very bright stones with vivid colors. Scheelite is found in many different environments, but one of the lesser known localities is in the high Pakistani Himalayas in the metamorphic contact at Khapalu. This is one of the most vibrant metamorphic Scheelites Iíve seen with a very bright orange color (richer in person than the photos show). The stone is only very very slightly included with a wide Trillion cut.



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Rob Lavinsky, rob@irocks.com

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