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Summer 1992, Volume 28, Issue 2

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Gem Trade Lab Notes


DIAMOND

  • Heat-Damaged Filled Diamond
  • Large Chameleon-Type Diamond
  • Treated "Black" Diamond

EMERALD Imitation: YAG

GLASS Imitations of Various Gems

PEARLS

  • Black, from Baja California
  • Treated Black Mabes

"Geneva [Synthetic] RUBY"

SAPPHIRE, Durability of Heat-Treated Stones

Identifying Curved Striae in Yellow SYNTHETIC SAPPHIRE



Appears on pages 123-128

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