Adolf Peretti, Karl Schmetzer, Heinz-Jürgen Bernhardt, and Fred Mouawad
The Yogo Sapphire Deposit
Keith A. Mychaluk
Meerschaum from Eskisehir Province, Turkey
Kadir Sariiz and Iskender Isik
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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