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Winter 1994, Volume 30, Issue 4

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Gem Trade Lab Notes


DIAMOND, Light Yellow Treated Color

Carved EMERALD Fetish

FELDSPAR, Separating Alkali from Plagioclase Species

GROSSULAR-ANDRADITE GARNET from Mali, West Africa

JADEITE JADE—Bleached and Impregnated, with Distinctive Surface Features

Spotted MALACHITE, Imitation and Natural

PEARLS

  • Abalone "Mabe" Pearl
  • Non-Nacreous Cultured "Pearl"

SAPPHIRE of Unusual Color

SYNTHETIC SAPPIRE, Another Striae Resolution Technique

Appears on pages 264-270

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