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Winter 1992, Volume 28, Issue 4

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Gem Trade Lab Notes


DIAMOND

  • With Etched Dislocation Channels
  • Colored Diamond Crystal Set in a "Renaissance Ring"

SYNTHETIC EMERALD

  • Overgrowth on Faceted Beryls Used in Jewelry

Pink Hydrogrossular GARNET

Black OPAL

Freshwater Natural PEARL from Alabama

Synthetic Green QUARTZ

SAPPHIRE

  • Color-Zoned Sapphire
  • Durability of Diffusion-Treated Sapphire
  • Yellow Sapphire with Unusual Fluorescence

SYNTHETIC STAR SAPPHIRE of Unusual Color

Unusual Bicolor ZOISITE

Appears on pages 262-267

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