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Gemologists have a list of flaws, one for external flaws and another for internal flaws. From the Wikipedia page:

  • "External flaws include blemishes, scratches, extra facets, fracture, 'fingerprints' pits, nicks, naturals, carbons and chips.
  • Internal flaws include crystal/mineral inclusions, pinpoint inclusions, needles, cloud, knots, grain lines, feathers, intergrowths, cleavage, etch channel and bearding."
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