demantoid

[ dih-man-toid ]

/ dɪˈmæn tɔɪd /

a brilliant green variety of andradite garnet, used as a gem.

Also called Uralian emerald.

Origin of demantoid

1890–95; < German, equivalent to (obsolete) Demant diamond (< Middle High German diemant < Old French diamant) + -oid -oid

Perhaps the adoption of the name "Demantoid" might relieve the situation.

A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public |Frank Bertram Wade
The demantoid garnet (sometimes called "olivine" in the trade).

A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public |Frank Bertram Wade
The luster, too, is diamond-like as the name "demantoid" signifies.

A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public |Frank Bertram Wade
The hardness is only 6.5, or lower even than that of quartz—a character rather adverse to the use of demantoid as a gem.

Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 10 |Various

The demantoid garnet is also very soft as compared with emerald (61⁄2 as against nearly 8).

A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public |Frank Bertram Wade

demantoid

/ (dɪˈmæntɔɪd) /

a bright green variety of andradite garnet

C19: from German, from obsolete Demant diamond, from Old French diamant + -oid