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Rare Demantoid Garnet 1.24 ct w Slight Horsetail Untreated Namibia Mine
- SKU
- 寸法(mm)
- 7.330 x 5.660 x 3.650mm
- 重さ (CT)
- 1.240
- Treatment
- No Treatment
- Shape
- Oval
- タイプ
- Faceted
- 色
-
Demantoid is a garnet gemstone variety with an emerald-green color and mesmerizing, diamond-like sparkle. This type of garnet originates from Russia, sometimes dubbed the “Czar of garnets.” It’s known for being the most brilliant and currently most valuable garnet variety.
Are demantoids rare? Very rare — one of the rarest varieties of garnet, in fact! You probably know red garnets the best, as green is one of the rarest but also very desirable garnet colors. Even further, demantoid is one of the rarest colored gemstones, too!
Demantoid is a brilliant green semi-precious gemstone in the andradite garnet species. The only other green garnets are uvarovite, tsavorite, sometimes Mali garnet, and of course, demantoid.
Because it resembles peridot, other names used for demantoid include olivine, Uralian emerald, Ural chrysolite, Siberian chrysolite, and Bobrovsk emerald. However, these are all incorrect and against regulations set by the Federal Trade Commission (FTC).
As a garnet, demantoid serves as a birthstone for January, as well as a Capricorn or Aquarius zodiac stone. Additionally, green garnets traditionally commemorate the 25th wedding anniversary!
Demantoid Specifications & Characteristics
Demantoid is an andradite, the iron- and calcium-rich garnet species — formula Ca3Fe2(SiO4)3 — in the larger ugrandite garnet group. Other andradite garnets are topazolite, melanite, and rainbow andradite, but demantoid is the most valuable and widely known andradite variety.
The easiest way to identify demantoids is by the presence of horsetail inclusions (discussed more in-depth in the Clarity section). Not every demantoid has these inclusions, but demantoid is the only green gemstone that has them. Outside of demantoid, they’ve only been found in brown andradite as of 2018.
With a Mohs scale ranking of 6.5 to 7, demantoid’s hardness is the only trait that puts it slightly below other garnets.
On the other hand, demantoid beats other garnets with its diamond-like luster and high dispersion (a.k.a. “fire” or colorful sparkle). The dispersion (0.057) is even higher than that of diamond at 0.044!
Here are all of the demantoid garnet properties:
Mineral family: Andradite Garnet
Mohs hardness: 6.5-7
Color: Yellow-green, emerald-green, or deep green, sometimes brownish tint
Crystal structure: Isometric/Cubic
Luster: Adamantine
Transparency: Transparent
Refractive index: 1.880-1.888
Density: 3.81-3.89
Cleavage: None
Fracture: Conchoidal
Streak: White
Luminescence: None
Optical effects: Rarely chatoyancy
TREATMENT NONE
COLOR GREEN
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- SKU
- 寸法(mm)
- 7.330 x 5.660 x 3.650 mm
- 重さ (CT)
- 1.240
- Treatment
- No Treatment
- Shape
- Oval
- タイプ
- Faceted
- 色
-
Demantoid is a garnet gemstone variety with an emerald-green color and mesmerizing, diamond-like sparkle. This type of garnet originates from Russia, sometimes dubbed the “Czar of garnets.” It’s known for being the most brilliant and currently most valuable garnet variety.
Are demantoids rare? Very rare — one of the rarest varieties of garnet, in fact! You probably know red garnets the best, as green is one of the rarest but also very desirable garnet colors. Even further, demantoid is one of the rarest colored gemstones, too!
Demantoid is a brilliant green semi-precious gemstone in the andradite garnet species. The only other green garnets are uvarovite, tsavorite, sometimes Mali garnet, and of course, demantoid.
Because it resembles peridot, other names used for demantoid include olivine, Uralian emerald, Ural chrysolite, Siberian chrysolite, and Bobrovsk emerald. However, these are all incorrect and against regulations set by the Federal Trade Commission (FTC).
As a garnet, demantoid serves as a birthstone for January, as well as a Capricorn or Aquarius zodiac stone. Additionally, green garnets traditionally commemorate the 25th wedding anniversary!
Demantoid Specifications & Characteristics
Demantoid is an andradite, the iron- and calcium-rich garnet species — formula Ca3Fe2(SiO4)3 — in the larger ugrandite garnet group. Other andradite garnets are topazolite, melanite, and rainbow andradite, but demantoid is the most valuable and widely known andradite variety.
The easiest way to identify demantoids is by the presence of horsetail inclusions (discussed more in-depth in the Clarity section). Not every demantoid has these inclusions, but demantoid is the only green gemstone that has them. Outside of demantoid, they’ve only been found in brown andradite as of 2018.
With a Mohs scale ranking of 6.5 to 7, demantoid’s hardness is the only trait that puts it slightly below other garnets.
On the other hand, demantoid beats other garnets with its diamond-like luster and high dispersion (a.k.a. “fire” or colorful sparkle). The dispersion (0.057) is even higher than that of diamond at 0.044!
Here are all of the demantoid garnet properties:
Mineral family: Andradite Garnet
Mohs hardness: 6.5-7
Color: Yellow-green, emerald-green, or deep green, sometimes brownish tint
Crystal structure: Isometric/Cubic
Luster: Adamantine
Transparency: Transparent
Refractive index: 1.880-1.888
Density: 3.81-3.89
Cleavage: None
Fracture: Conchoidal
Streak: White
Luminescence: None
Optical effects: Rarely chatoyancy
TREATMENT NONE
COLOR GREEN
Feel free to to “make an offer” on our other items :)
We Accept Payments through
Paypal
Direct Deposit
Credit Cards
| 配送業者 | 発送先:国 | その他の国への配送 |
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世界のその他の地域
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:数量以上のアイテムを含む注文では、:プロバイダーは $10.00 に割引されます
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ポジティブExcellent stone, exactly as pictured. No hidden imperfections. Strong colour saturation, accurate to pictures in good daylight. 100% would be a repeat buyer from Zayangems
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ポジティブ
Beautiful gem absolutely love it. Thank you.
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ポジティブ
as described an awesome sphene gemstone,sparkling just like in a video.very fast postage thank you
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入札する場合、これはユーザーが製品に入札する意思のある最大金額です。その後、当社のシステムがそのユーザーに代わって自動的に入札し、最高入札者としての地位を維持するために、指定された最大値まで入札額を段階的に引き上げます。
「自動入札」を示すアイコンがある場合、システムが最高入札額に基づいてユーザーに積極的に入札していることを意味します。これは、ユーザーが自分自身を上回って入札しているように見えるかもしれませんが、ユーザーの上限を反映するためにシステムが入札を更新した結果にすぎません。
監査
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説明が正確
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正確な写真
Comments
The Verified Seller responsible for this item has diligently provided us with accurate and comprehensive information, encompassing crucial details such as weight, dimensions, and treatment. It is important to reiterate our commitment to upholding the highest standards of integrity and transparency in the gemstone industry. As part of our policy, we strictly permit the sale of exclusively natural gemstones that have been sourced directly from the Earth. However, in the event that a gemstone has undergone any form of treatment, it is mandatory for the seller to provide full disclosure regarding the treatment process. Furthermore, we would like to emphasize that man-made gemstones, including simulants and imitations, are strictly prohibited on our platform. We prioritize the promotion of authentic, natural gemstones to ensure a genuine and trustworthy marketplace for our valued customers. Should you have any further inquiries or require additional assistance, please do not hesitate to reach out. We are here to assist you and provide a seamless experience on Gem Rock Auctions.
