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Summer 1992, Volume 28, Issue 2

EDITORIAL

Thank You, Donors p.79

FEATURE ARTICLES

Gem Wealth of Tanzania p.80-p.102
Dona M. Dirlam, Elise B. Misiorowski, Rosemary Tozer, Karen B. Stark, and Allen M. Bassett

NOTES AND NEW TECHNIQUES

Gamma-Ray Spectroscopy to Measure Radioactivity in Gemstones p.104-p.111
Charles E. Ashbaugh III
Dyed Natural Corundum as a Ruby Imitation p.112-p.115
K. Schmetzer, H.A. Hänni, E.P. Jegge, and F.-J. Schupp
An Update on Sumitomo Gem-Quality Synthetic Diamonds p.116-p.122
James E. Shigley, Emmanuel Fritsch, Ilene Reinitz, and Mike Moon

REGULAR FEATURES

Gem Trade Lab Notes p.123-p.128
Gem News p.129-p.139
Letters p.140
Gemological Abstracts p.141-p.148

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