peridot

noun

1. (countable, uncountable)A transparent olive green form of olivine, used as a gem.

   “Gem-quality olivine is known as peridot, which has a subtle green light all its own.”

   “Although there are dozens of different types of gems, among the best known and most important are […]. (Common gem materials not addressed in this article include amber, amethyst, chalcedony, garnet, lazurite, malachite, opals, peridot, rhodonite, spinel, tourmaline, turquoise and zircon.)”

2. (countable, uncountable)A yellow-green color, like that of the peridot.