peridot

plural peridots

1. countableuncountableA 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.

   2004, Richard Fortey, The Earth, Folio Society, published 2011, page 51

   1 more example

   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.)

   2012 March 28, Lee A. Groat, “Gemstones”, in American Scientist, volume 100, number 2, archived from the original on 14 Jun 2012, page 128

2. countableuncountableA yellow-green color, like that of the peridot.