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Spring 1999, Volume 35, Issue 1

EDITORIAL

Symposium ’99--You Can’t Afford to Miss It! p.1
The Dr. Edward J. Gübelin Most Valuable Article Award p.2

FEATURE ARTICLES

The Identification Of Zachery-Treated Turquoise p.4-p.16
Emmanuel Fritsch, Shane F. McClure, Mikhail Ostrooumov, Yves Andres, Thomas Moses, John I. Koivula, and Robert C. Kammerling
Some Diagnostic Features of Russian Hydrothermal Synthetic Rubies and Sapphires p.17-p.28
Karl Schmetzer and Adolf Peretti
The Separation Of Natural From Synthetic Colorless Sapphire p.30-p.41
Shane Elen and Emmanuel Fritsch

REGULAR FEATURES

Gem News p.42-p.46
Gem Trade Lab Notes p.42-p.46
Gem News highlight: Drill holes as design elements: Michael M. Dyber and ’Luminaires.’ p.57
Gems & Gemology Challenge p.61-p.62
Book Reviews p.63-p.64
Gemological Abstracts p.65-p.76

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