opaque gem

Noun
  1. A gemstone that is opaque (synset 114994225)
    is a type of: gem, gemstone, stone - a crystalline rock that can be cut and polished for jewelry
    subtypes:
    • chrysoberyl - a rare hard yellow green mineral consisting of beryllium aluminate in crystal form; used as a gemstone
    • opal - a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones
    • cat's eye - any of various gems (as chrysoberyl or chalcedony) that reflect light when cut in a rounded shape
    • coral, precious coral, red coral - the hard stony skeleton of a Mediterranean coral that has a delicate red or pink color and is used for jewelry
    • jade, jadestone - 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
    • lapis lazuli, lazuli - an azure blue semiprecious stone
    • turquoise - a blue to grey green mineral consisting of copper aluminum phosphate

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