#gemstone__gem__stone  a crystalline rock that can be cut and polished for jewelry
  supertype:  #crystal  a solid formed by the solidification of a chemical and having a highly regular atomic structure
  subtype:  #cabochon  #opaque_gem  #transparent_gem
  part of:  #jewelry__jewellery  an adornment (as a bracelet or ring or necklace) made of precious metals and set with gems (or imitation gems)

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