Summer 1991

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The PDF version of this issue is available at no charge. Visit www.gia.edu Fracture Filling of Emeralds: Opticon and Traditional "Oils"Robert C. Kammerling, John I. Koivula, Robert E. Kane, Patricia Maddison, James E. Shigley, and Emmanuel Fritsch Emeralds from the Ural Mountains, USSRKarl Schmetzer, Heinz-Jürgen Bernhardt, and Rudolf Biehler Treated Andamooka Matrix OpalGrahame Brown Every issue also includes the most up-to-date reports from the GIA Laboratory (Lab Notes) and gemologists around the world (Gem News International).GIA students and alumni save 10% on back issues! Enter coupon code GGALUM at checkout. SKU: 439103 Show more