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4.50 Ct Incredible Natural Grandidierite Gemstone - SKU- 4
- SKU
- 寸法(mm)
- 12.000 x 9.730 x 5.750mm
- 重さ (CT)
- 4.500
- 色
-
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.
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.
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.
Name: GRANDIDIERITE GEMSTONE
Place of Origin: MADAGASCAR
TREATMENT: NATURAL
- SKU
- 寸法(mm)
- 12.000 x 9.730 x 5.750 mm
- 重さ (CT)
- 4.500
- 色
-
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.
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.
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.
Name: GRANDIDIERITE GEMSTONE
Place of Origin: MADAGASCAR
TREATMENT: NATURAL
| 配送業者 | 配送先Thailand | その他の国への配送 |
|---|---|---|
| Standard Shipping - Tracked | $10.00 / 21 | $15.00 / 21 |
|
：国
Standard Shipping - Tracked 、 2以上のアイテムを含む注文で$16.00に割引されます
世界のその他の地域
Standard Shipping - Tracked 、 2以上のアイテムを含む注文で$16.00に割引されます
|
||
| FedEx | $28.00 / 12 | $28.00 / 12 |
|
：国
FedEx 、 2以上のアイテムを含む注文で$28.00に割引されます
世界のその他の地域
FedEx 、 2以上のアイテムを含む注文で$28.00に割引されます
|
||
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ポジティブThis is REALLY nice
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ポジティブ
5 Star Excellent Seller! YES>All pieces received YES>Color saturation accurate YES>Clarity accurate YES>Weight within +- 0.1ct YES>Shipped within 3 days after payment
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ポジティブ
5 Star Excellent Seller! YES>All pieces received YES>Color saturation accurate YES>Clarity accurate YES>Weight within +- 0.1ct YES>Shipped within 3 days after payment
-
ポジティブ
5 Star Excellent Seller! YES>All pieces received YES>Color saturation accurate YES>Clarity accurate YES>Weight within +- 0.1ct YES>Shipped within 3 days after payment
-
ポジティブ
5 Star Excellent Seller! YES>All pieces received YES>Color saturation accurate YES>Clarity accurate YES>Weight within +- 0.1ct YES>Shipped within 3 days after payment
