gem

a highly polished gem that is cut convexly but without facets

a gemstone that is opaque

a gemstone having the property of transmitting light without serious diffusion

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

any of a group of hard glassy minerals (silicates of various metals) used as gemstones and as an abrasive

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

a transparent purple variety of quartz; used as a gemstone

a transparent variety of beryl that is blue green in color

any of various gems (as chrysoberyl or chalcedony) that reflect light when cut in a rounded shape

a milky or greyish translucent to transparent quartz

a brown or yellow-green olivine found in igneous and metamorphic rocks and used as a gemstone

a green variety of chalcedony valued as a gemstone

semiprecious yellow quartz resembling topaz

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

very hard native crystalline carbon valued as a gem

a green transparent form of beryl; highly valued as a gemstone

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

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

a pinkish lilac crystal form of the mineral spodumene that is used as a gemstone

an azure blue semiprecious stone

a transparent or translucent gemstone with a pearly luster; some specimens are orthoclase feldspar and others are plagioclase feldspar

a kind of pink beryl used as a gemstone

a pale green variety of chrysolite; used as a gemstone

a transparent deep red variety of corundum; used as a gemstone and in lasers

a deep blue cordierite often used as a gemstone

a precious transparent stone of rich blue corundum valued as a gemstone

a green transparent form of the mineral spodumene used as a gemstone

a translucent quartz spangled with bits of mica or other minerals

a mineral (fluosilicate of aluminum) that occurs in crystals of various colors and is used as a gemstone

a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones

a blue to grey green mineral consisting of copper aluminum phosphate

a precious stone that is a valuable part of a sovereign's regalia

a gem (usually a diamond) in a setting by itself

a transparent piece of diamond that has been cut and polished and is valued as a precious gem

a transparent piece of ruby that has been cut and polished and is valued as a precious gem

a smooth lustrous round structure inside the shell of a clam or oyster; much valued as a jewel

a transparent piece of emerald that has been cut and polished and is valued as a precious gem

a transparent piece of sapphire that has been cut and polished and is valued as a precious gem

diamonds

a small imperfect pearl