pietra dura

Definitions of pietra dura
  1. noun
    a gemstone that is opaque
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    types:
    giada
    a semiprecious gemstone that takes a high polish; is usually green but sometimes whitish; consists of jadeite or nephrite
    lapislazzuli
    an azure blue semiprecious stone
    turchese
    a blue to grey green mineral consisting of copper aluminum phosphate
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