chrysoberyl - a rare hard yellow green mineral consisting of beryllium aluminate in crystal form; used as a gemstone

opal - a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones

gem, gemstone, stone - a crystalline rock that can be cut and polished for jewelry; "he had the gem set in a ring for his wife"; "she had jewels made of all the rarest stones"

cat's eye - any of various gems (as chrysoberyl or chalcedony) that reflect light when cut in a rounded shape

precious coral, red coral, coral - the hard stony skeleton of a Mediterranean coral that has a delicate red or pink color and is used for jewelry

jade, jadestone - a semiprecious gemstone that takes a high polish; is usually green but sometimes whitish; consists of jadeite or nephrite

jasper - an opaque form of quartz; red or yellow or brown or dark green in color; used for ornamentation or as a gemstone

lapis lazuli, lazuli - an azure blue semiprecious stone

turquoise - a blue to gray green mineral consisting of copper aluminum phosphate; blue turquoise is valued as a gemstone