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 hardness of Demantoid shown against the ten reference minerals, from talc (1) to diamond (10).

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

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About Demantoid

O demantóide é a variedade verde do granato andradite e é considerado um dos granatos mais valiosos e raros. O seu nome deriva do neerlandês para "diamantino", refletindo o seu brilho excecional que supera mesmo o do diamante. A dispersão do demantóide é superior à do diamante, criando um "fogo" extraordinário. As inclusões em forma de cauda de cavalo de fibras de byssólite são características dos exemplares russos e são consideradas um indicador de autenticidade e qualidade.