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Fall 1991, Volume 27, Issue 3

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Gem Trade Lab Notes


DIAMOND

  • With Hexagonal Indented Natural
  • Type IIb with Natural Irradiation Stains

PEARLS

  • Cultured Pearl, Accidentally Tissue-Nucleated
  • Green-Dyed Natural Pearls
  • Natural- and Treated-Color Black Cultured Pearls in the Same Necklace
  • Remarkable Cultured Pearl
  • A "Teething" Problem
  • "Treated" Mabe Pearls
  • Two Different Mabe Pearls

Early SYNTHETIC RUBIES

Diffusion-Treated SAPPHIRES in Fine Jewelry

Appears on pages 174-179

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