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Summer 1991, Volume 27, Issue 2

EDITORIAL

Information and Communication: Keys to the Future p.69

FEATURE ARTICLES

Fracture Filling of Emeralds: Opticon and Traditional "Oils" p.70-p.85
Robert C. Kammerling, John I. Koivula, Robert E. Kane, Patricia Maddison, James E. Shigley, and Emmanuel Fritsch
Emeralds from the Ural Mountains, USSR p.86-p.99
Karl Schmetzer, Heinz-Jürgen Bernhardt, and Rudolf Biehler

NOTES AND NEW TECHNIQUES

Treated Andamooka Matrix Opal p.100-p.106
Grahame Brown

REGULAR FEATURES

Gem Trade Lab Notes p.108-p.115
Gem News p.116-p.125
Editorial Forum p.126
Gemological Abstracts p.127-p.134
"Perfect" Challengers p.192
Book Reviews p.193
Gemological Abstracts p.195-p.202

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