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Daniel A. Sauer, Alice S. Keller, and Shane F. McClure
Karl Schmetzer, Henry A. H‰nni, Heinz-J¸rgen Bernhardt, and Dietmar Schwarz
Some Gemological Challenges in Identifying Black Opaque Gem Materials
Mary L. Johnson, Shane F. McClure, and Dino G. DeGhionno
Enstatite, Cordierite, Kornerupine, and Scapolite with Unusual Properties from Embilipitiya, Sri Lanka
Pieter C. Zwaan
Some Tanzanite Imitations
Lore Kiefert and Susanne Th. Schmidt
Every issue also includes the most up-to-date reports from the GIA Laboratory (Lab Notes) and gemologists around the world (Gem News International).
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