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

Mohs Hardness 6.5
Specific Gravity 3.77 – 3.95
Refractive Index 1.88 – 1.89
Crystal System Isometric
Color various

Mohs Hardness

Mohs Hardness: 6.5
1 Soft10 Hard

Crystal System

Value & Market

Price Tier Moderate ($50-500/ct)

About Demantoid

Demantoid is the magnificent green variety of andradite garnet, celebrated as having higher dispersion than any other natural gemstone including diamond, producing fiery spectral flashes visible even in subdued light. Russian demantoid from the Ural Mountains—identifiable by characteristic 'horsetail' fibrous chrysotile inclusions—remains the most prized, while Namibian and Italian sources provide additional supply. First discovered in Russia in 1853, demantoid is considered by many collectors to be the most magnificent of all garnets.

Jewelry Use

Durability 6/10

Science FYI Family

Frequently Asked Questions

What is Demantoid?
Demantoid is the magnificent green variety of andradite garnet, celebrated as having higher dispersion than any other natural gemstone including diamond, producing fiery spectral flashes visible even in subdued light. Russian demantoid from the Ural Mountains—identifiable by characteristic 'horsetai
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.

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