Robert C. Kammerling, John I. Koivula, Robert E. Kane, Patricia Maddison, James E. Shigley, and Emmanuel Fritsch
Emeralds from the Ural Mountains, USSR
Karl Schmetzer, Heinz-J¸rgen Bernhardt, and Rudolf Biehler
Treated Andamooka Matrix Opal
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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