#transparent_gem  a gemstone having the property of transmitting light without serious diffusion
  supertype:  #gemstone__gem__stone  a crystalline rock that can be cut and polished for jewelry
  subtype:  #garnet  any of a group of hard glassy minerals (silicates of various metals) used as gemstones and as an abrasive
     subtype:  #almandite__almandine  a deep red garnet consisting of iron aluminum silicate
     subtype:  #andradite  a garnet consisting of calcium iron silicate and having any color ranging from yellow and green to brown and black; used as gemstone
        subtype:  #demantoid  a green andradite used as a gemstone
     subtype:  #carbuncle.garnet  deep-red cabochon-cut garnet cut without facets
     subtype:  #cinnamon_stone__essonite__hessonite  a garnet ranging in color from yellow to brown
     subtype:  #pyrope  a deep red garnet used as a gemstone
     subtype:  #rhodolite  a red or pink variety of garnet used as a gemstone
  subtype:  #amethyst  a transparent purple variety of quartz; used as a gemstone
  subtype:  #aquamarine  a transparent variety of beryl that is blue green in color
  subtype:  #chalcedony__calcedony  a milky or grayish translucent to transparent quartz
     subtype:  #agate  an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles
        subtype:  #moss_agate  an agate with brown, black, or green moss-like markings
     subtype:  #bloodstone__heliotrope  green chalcedony with red spots that resemble blood
     subtype:  #carnelian__cornelian  a translucent red or orange variety of chalcedony
     subtype:  #chrysoprase  a green variety of chalcedony valued as a gemstone
     subtype:  #onyx  a chalcedony with alternating black and white bands; used in making cameos
        subtype:  #sardonyx  an onyx characterized by parallel layers of sard and a different colored mineral
     subtype:  #plasma.chalcedony  a green slightly translucent variety of chalcedony used as a gemstone
     subtype:  #sard__sardine__sardiu  a deep orange-red variety of chalcedony
  subtype:  #chrysolite  a brown or yellow-green olivine found in igneous and metamorphic rocks and used as a gemstone
     subtype:  #peridot  a pale green variety of chrysolite; used as a gemstone
  subtype:  #chrysoprase  a green variety of chalcedony valued as a gemstone
  subtype:  #citrine  semiprecious yellow quartz resembling topaz
  subtype:  #adamant__diamond  very hard native crystalline carbon valued as a gem
     subtype:  #black_diamond__blackdiamond__carbonado  an inferior dark diamond used in industry for drilling and polishing
  subtype:  #emerald.beryl  a green transparent form of beryl; highly valued as a gemstone
  subtype:  #kunzite  a pinkish lilac crystal form of the mineral spodumene that is used as a gemstone
  subtype:  #moonstone  a transparent or translucent gemstone with a pearly luster; some specimens are orthoclase feldspar and others are plagioclase feldspar
  subtype:  #morganite  a kind of pink beryl used as a gemstone
  subtype:  #peridot  a pale green variety of chrysolite; used as a gemstone
  subtype:  #ruby.corundom  a transparent deep red variety of corundum; used as a gemstone and in lasers
  subtype:  #water_sapphire__watersapphire  a deep blue cordierite often used as a gemstone
  subtype:  #sapphire.corundom  a precious transparent stone of rich blue corundum valued as a gemstone
     subtype:  #star_sapphire  a sapphire that when cut shows a star-like figure in reflected light because of its crystalline structure
  subtype:  #hiddenite  a green transparent form of the mineral spodumene used as a gemstone
  subtype:  #sunstone__aventurine  a translucent quartz spangled with bits of mica or other minerals
     subtype:  #goldstone  aventurine spangled densely with fine gold-colored particles
  subtype:  #topaz  a mineral (fluosilicate of aluminum) that occurs in crystals of various colors and is used as a gemstone
  subtype:  #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

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