A bright green variety of andradite garnet that sparkles like a diamond, valued as a gemstone.
From German 'diamantoid,' combining diamant (diamond) with -oid (resembling). The 'de-' prefix was gradually added and transformed into 'dem-' in English. The name refers to its diamond-like brilliance.
Demantoid is so rare and brilliant that one small stone from Russia's Ural Mountains can cost more than a genuine diamond of the same size—collectors treasure it precisely because almost nobody has ever heard of it.
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