demantoid

noun
dem·an·toid | \ˈde-mən-ˌtȯid \

Definition of demantoid 

: a green variety of garnet used as a gem

First Known Use of demantoid

circa 1890, in the meaning defined above

History and Etymology for demantoid

German, from obsolete German Demant diamond, from Middle High German diemant, from Old French diamant — more at diamond

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The first known use of demantoid was circa 1890

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Britannica.com: Encyclopedia article about demantoid

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