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7.25CT BOLIVIAN AMETRINE BEST QUALITY STONES IGCAMCB43
- SKU
- Dimensioni (mm)
- 13.000 x 10.000 x 6.000mm
- Peso (cts)
- 7.250
- Treatment
- No Treatment
- Tipo
- Faceted
- Colori
-
Grandidierite Description
Gem-quality grandidierite is extremely rare, and it often appears on the list of the 10 rarest varieties in the world, along with gems like jeremejevite, painite, benitoite and taafeite. Many rare gem collectors would love to add grandidierite to their collections, but it has been almost impossible to find. The recent discovery of some gem quality material in Madagascar has now made a few high quality stones available. Grandidierite was first discovered in 1902 in Madagascar by Alfred Lacroix, a French mineralogist. Lacroix named the mineral in honor of French explorer and naturalist Alfred Grandidier (1836–1912), the first authority on the natural history of Madagascar. Since its initial discovery, samples of grandidierite have been found in only a few locations around the world, including Malawi, Namibia and Sri Lanka. But the few gem quality specimens have come mainly from Madagascar. Gemologically, grandidierite is a magnesium aluminum borosilicate. It has a hardness of 7 to 7.5 on the Mohs scale, similar to garnet; a density of 2.85 to 3.00, in the approximate range of tourmaline; and a refractive index of 1.590-1.623. It forms in the orthorhombic crystal system. Grandidierite is typically bluish green in color and derives its distinctive color from traces of iron. The hardness of the gem makes attractive fine jewelry, but cutters must be careful when shaping the stone to avoid fractures. Jewel experts typically cannot set a specific price for the gem, but they generally estimate about $20,000 a carat. INFORMATION Color: Bluish green Twinning: none Cleavage : Perfect Fracture: Brittle scale hardness: 7.5 Luster: Vitreous, Pearly Streak: White Diaphaneity: Transparent, Translucent Density: 2.976 Optical properties: Biaxial (-) Refractive index: 1.583 - 1.639 Pleochroism: Visible 2V angleMeasured: 24° to 32°, Calculated: 32° Dispersion: strong r < v>
TREATMENT : UNHEATED
(IGC WE OFFER BEST SERVICE OF SHIPPING IN NO RESERVE AUCTION NO COMBINE SHIPPING OFFER THE COST IS 6$ FOR PER
ITEM IN NO RESERVE AUCTION .
BUY NOW AND RESERVE AUCTION YOU CAN COMBINE UPTO 8 ITEMS IN ONE SHIPPING COST
(BUYER MUST PAY BETWENN 2 DAYS OF AUCTION END OTHERWISE ORDER WILL BE CANCEL )
AIRMAIL RAGISTERED SHIPPING 5$ 7-21 DAYS
DHL EXPRESS SHIPPING 25$ 3-4 DAYS CHECK OUT OUR MORE ITEMS IN OUT STORE THERE YOU CAN GET MANY BEAUTIFUL GEMSTONES , BEADS AND JEWELRY ALSO MINERALS SPECIMENS
IF YOU HAVE ANY PROBLEM WITH RECEIVE ITEM PLEASE DO NOT PUT NEGATIVE FEEDBACK WE ARE WELCOME TO SOLVE ALL YOUR
PROBLEMS REFUND , RE-POLISH , RETURN , EXCHANGE ALL ACCEPTED , WE WILL NEVER LET YOU UPSET FROM US IN SHA ALLAH
WE ACCEPT PAYPAL ONLY PAYPAL
- SKU
- Dimensioni (mm)
- 13.000 x 10.000 x 6.000 mm
- Peso (cts)
- 7.250
- Treatment
- No Treatment
- Tipo
- Faceted
- Colori
-
Grandidierite Description
Gem-quality grandidierite is extremely rare, and it often appears on the list of the 10 rarest varieties in the world, along with gems like jeremejevite, painite, benitoite and taafeite. Many rare gem collectors would love to add grandidierite to their collections, but it has been almost impossible to find. The recent discovery of some gem quality material in Madagascar has now made a few high quality stones available. Grandidierite was first discovered in 1902 in Madagascar by Alfred Lacroix, a French mineralogist. Lacroix named the mineral in honor of French explorer and naturalist Alfred Grandidier (1836–1912), the first authority on the natural history of Madagascar. Since its initial discovery, samples of grandidierite have been found in only a few locations around the world, including Malawi, Namibia and Sri Lanka. But the few gem quality specimens have come mainly from Madagascar. Gemologically, grandidierite is a magnesium aluminum borosilicate. It has a hardness of 7 to 7.5 on the Mohs scale, similar to garnet; a density of 2.85 to 3.00, in the approximate range of tourmaline; and a refractive index of 1.590-1.623. It forms in the orthorhombic crystal system. Grandidierite is typically bluish green in color and derives its distinctive color from traces of iron. The hardness of the gem makes attractive fine jewelry, but cutters must be careful when shaping the stone to avoid fractures. Jewel experts typically cannot set a specific price for the gem, but they generally estimate about $20,000 a carat. INFORMATION Color: Bluish green Twinning: none Cleavage : Perfect Fracture: Brittle scale hardness: 7.5 Luster: Vitreous, Pearly Streak: White Diaphaneity: Transparent, Translucent Density: 2.976 Optical properties: Biaxial (-) Refractive index: 1.583 - 1.639 Pleochroism: Visible 2V angleMeasured: 24° to 32°, Calculated: 32° Dispersion: strong r < v>
TREATMENT : UNHEATED
(IGC WE OFFER BEST SERVICE OF SHIPPING IN NO RESERVE AUCTION NO COMBINE SHIPPING OFFER THE COST IS 6$ FOR PER
ITEM IN NO RESERVE AUCTION .
BUY NOW AND RESERVE AUCTION YOU CAN COMBINE UPTO 8 ITEMS IN ONE SHIPPING COST
(BUYER MUST PAY BETWENN 2 DAYS OF AUCTION END OTHERWISE ORDER WILL BE CANCEL )
AIRMAIL RAGISTERED SHIPPING 5$ 7-21 DAYS
DHL EXPRESS SHIPPING 25$ 3-4 DAYS CHECK OUT OUR MORE ITEMS IN OUT STORE THERE YOU CAN GET MANY BEAUTIFUL GEMSTONES , BEADS AND JEWELRY ALSO MINERALS SPECIMENS
IF YOU HAVE ANY PROBLEM WITH RECEIVE ITEM PLEASE DO NOT PUT NEGATIVE FEEDBACK WE ARE WELCOME TO SOLVE ALL YOUR
PROBLEMS REFUND , RE-POLISH , RETURN , EXCHANGE ALL ACCEPTED , WE WILL NEVER LET YOU UPSET FROM US IN SHA ALLAH
WE ACCEPT PAYPAL ONLY PAYPAL
Fornitore di spedizioni | Spedizione in :paese | Spedizione nel resto del mondo |
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FedEx | $50.00 / : giorni giorni | $50.00 / : giorni giorni |
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Express Shipping | $11.00 / : giorni giorni | $11.00 / : giorni giorni |
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Positivo
Paid and shipped - no feedback left after 100 days
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Positivo
Quick shipment, good quality
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Positivo
Quick shipment, good quality
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Positivo
Very beautiful Gemstone, everything is 100% ok
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Positivo
Nice amber
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Positivo
Very beautiful Gemstone, everything is 100% ok
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