demantoid

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demantoid

[də′man‚toid]
(mineralogy)
A lustrous, green variety of andradite; used as a gem.
References in periodicals archive ?
and LULZAC, Y (2009a) Ambaja (Madagascar)--A new source of gem demantoid garnet.
The most valuable garnets are, in fact, a bright leaf green: demantoid garnets, which were first discovered in the Ural mountains in the 19th Century.
Stadther later presented them with the actual jewel--a 19th-century piece set with 85 green demantoid garnets and 25 diamonds.