transparent gem

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

a transparent purple variety of quartz; used as a gemstone

a transparent variety of beryl that is blue green in color

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

very hard native crystalline carbon valued as a gem

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

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

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 deep red garnet consisting of iron aluminum silicate

an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles

green chalcedony with red spots that resemble blood

an inferior dark diamond used in industry for drilling and polishing

a translucent red or orange variety of chalcedony

a garnet consisting of calcium iron silicate and having any color ranging from yellow and green to brown and black; used as gemstone

deep-red cabochon garnet cut without facets

aventurine spangled densely with fine gold-colored particles

a garnet ranging in color from yellow to brown

a chalcedony with alternating black and white bands; used in making cameos

a green slightly translucent variety of chalcedony used as a gemstone

a deep red garnet used as a gemstone

a red or pink variety of garnet used as a gemstone

a deep orange-red variety of chalcedony

black tourmaline

a sapphire that when cut shows a starlike figure in reflected light because of its crystalline structure