transparent gem

/træntˌspɛrənt dʒɛm/

Other forms: transparent gems

Definitions of transparent gem

1. noun

   a gemstone having the property of transmitting light without serious diffusion
   types:

   garnet

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

   amethyst

   a transparent purple variety of quartz; used as a gemstone

   aquamarine

   a transparent, light blue or bluish-green variety of the mineral beryl, used as a gemstone

   calcedony, chalcedony

   a milky or greyish translucent to transparent quartz

   chrysolite

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

   chrysoprase

   a green variety of chalcedony valued as a gemstone

   citrine

   semiprecious yellow quartz resembling topaz

   adamant, diamond

   very hard native crystalline carbon valued as a gem

   emerald

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

   kunzite

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

   moonstone

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

   morganite

   a kind of pink beryl used as a gemstone

   peridot

   a pale green variety of chrysolite; used as a gemstone

   ruby

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

   water sapphire

   a deep blue cordierite often used as a gemstone

   sapphire

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

   hiddenite

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

   aventurine, sunstone

   a translucent quartz spangled with bits of mica or other minerals

   topaz

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

   tourmaline

   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

   almandine, almandite

   a deep red garnet consisting of iron aluminum silicate

   agate

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

   bloodstone, heliotrope

   green chalcedony with red spots that resemble blood

   black diamond, carbonado

   an inferior dark diamond used in industry for drilling and polishing

   carnelian, cornelian

   a translucent red or orange variety of chalcedony

   chrysoprase

   a green variety of chalcedony valued as a gemstone

   andradite

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

   carbuncle

   deep-red cabochon garnet cut without facets

   goldstone

   aventurine spangled densely with fine gold-colored particles

   cinnamon stone, essonite, hessonite

   a garnet ranging in color from yellow to brown

   onyx

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

   peridot

   a pale green variety of chrysolite; used as a gemstone

   plasma

   a green slightly translucent variety of chalcedony used as a gemstone

   pyrope

   a deep red garnet used as a gemstone

   rhodolite

   a red or pink variety of garnet used as a gemstone

   sard, sardine, sardius

   a deep orange-red variety of chalcedony

   schorl

   black tourmaline

   star sapphire

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

   type of:

   gem, gemstone, stone

   a crystalline rock that can be cut and polished for jewelry