Definition that contains gemstone
- troy a system of weights used for precious metals and gemstones; based on a 12-ounce pound and an ounce of 480 grains
- ruby a transparent deep red variety of corundum; used as a gemstone and in lasers
- jade 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
- emerald a green transparent form of beryl; highly valued as a gemstone
- plasma a green slightly translucent variety of chalcedony used as a gemstone
- sapphire a precious transparent stone of rich blue corundum valued as a gemstone
- opal a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones
- topaz a mineral (fluosilicate of aluminum) that occurs in crystals of various colors and is used as a gemstone
- facet a smooth surface (as of a bone or cut gemstone)