opaque gem

/oʊˌpeɪk dʒɛm/

Other forms: opaque gems

Definitions of opaque gem

1. noun

   a gemstone that is opaque
   types:

   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

   alexandrite

   a green variety of chrysoberyl used as a gemstone

   black opal

   a dark colored opal with internal reflections of green or red

   fire opal, girasol

   an opal with flaming orange and yellow and red colors

   harlequin opal

   a reddish opal with small patches of brilliant color

   type of:

   gem, gemstone, stone

   a crystalline rock that can be cut and polished for jewelry