[…] salamanders, mermaids, chimaeras, wild men o’ the woods, leviathans, all hewn from faultless gems, thrice the bulk of a big man’s body, velvet-dark sapphires, chrysolite, beryl, amethyst, and the yellow zircon that is like transparent gold.
2012 March, Lee A. Groat, “Gemstones”, in American Scientist, volume 100, number 2, archived from the original on 14 June 2012, page 128:
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.)
(countable) A crystal of zircon, sometimes used as a false gemstone.
1982, “The Message”, performed by Grandmaster Flash and the Furious Five: