τόπαζος

Etymology
A loanword which, according to Pliny, was taken from the language of the Troglodytes, and named after an island of the same name in the Red Sea. However, according to Furnée, the existence of the gloss proves a  origin of the word. Also compare 🇨🇬.

Noun

 * 1) gem of green hue, probably chrysolite or peridot