Demantoid
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First discovered in Russia's Ural Mountains in 1853, demantoid is the green variety of andradite garnet, and it carries higher dispersion than any other natural gemstone, diamond included, producing fiery spectral flashes even in subdued light. Russian material, identifiable by fibrous horsetail chrysotile inclusions, remains the most prized, while Namibia and Italy add further supply. It crystallizes in the isometric system and measures 6.5 on the Mohs scale, softer than many garnets but exceptional in brilliance. Moderately priced among the semi-precious gems, demantoid is regarded by many collectors as the most magnificent of all garnets.
Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
6.5
Specific Gravity
3.77 – 3.95
Refractive Index
1.88 – 1.89
Crystal System
Isometric
Color
various
Mohs Hardness
| Mohs | Reference mineral | Demantoid |
|---|---|---|
| 1 | Talc | |
| 2 | Gypsum | |
| 3 | Calcite | |
| 4 | Fluorite | |
| 5 | Apatite | |
| 6 | Orthoclase | |
| 7 | Quartz | |
| 8 | Topaz | |
| 9 | Corundum | |
| 10 | Diamond |
Crystal System
Value & Market
Price Tier
Moderate ($50-500/ct)
Where to Buy Demantoid
Blue Nile
Fine jewelry retailer
James Allen
Gemstone jewelry
Brilliant Earth
Ethically sourced gems
Amazon
Wide selection
Links may earn a commission at no extra cost to you.
About Demantoid
デマントイドは、緑色のアンドラダイトガーネットの最も価値ある変種で、ガーネットの中でダイヤモンドを超える分散性を持ちます。「馬尾状」インクルージョン（ホーステール）は品質を証明する特徴です。ロシアのウラル山脈産が最高品質とされ、希少性と美しさから高い評価を受けています。
On this page
Jewelry Use
Durability
6/10
Science FYI Family
Frequently Asked Questions
What is Demantoid?
デマントイドは、緑色のアンドラダイトガーネットの最も価値ある変種で、ガーネットの中でダイヤモンドを超える分散性を持ちます。「馬尾状」インクルージョン（ホーステール）は品質を証明する特徴です。ロシアのウラル山脈産が最高品質とされ、希少性と美しさから高い評価を受けています。
What is the hardness of Demantoid?
Demantoid has a Mohs hardness of 6.5, making it moderate for use in jewelry.
What color is Demantoid?
Demantoid is primarily Various.
How much does Demantoid cost?
Demantoid falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Demantoid?
Demantoid belongs to the Isometric crystal system.