abraxas      a magical name which in antiquity was often engraved on a gem as a charm.
morion a dark variety of smoky quartz.
padparadschah a synthetic orange sapphire.
Venus hairstone a quartz crystal containing acicular rutile.
prase a leek-green cryptocrystalline chalcedony.
balas a rose-red species of spinel.
schorl black tourmaline.
carbonado to score and broil; a piece of meat so cooked.
ustulate scorched, blackened.
carbonado a Brazilian variety of black diamond.
girasol an opal; a Jerusalem artichoke. adjectivally, opalescent blue-white, with reddish reflections. [
adularescent (of gemstones, esp. |adularia|, an opalescent orthoclase) having a cloudy, bluish luster.
smaragd an emerald. (adj. "smaragdine")
pyrope a type of garnet, used as a gem. [< Gk /pyro~po's/ fire-eyed]
macle (crystallography, obs.) a twin.