Christopher P. Smith, George Bosshart, Johann Ponahlo, Vera M.F. Hammer, Helmut Klapper, and Karl Schmetzer
Sapphires from Antsiranana Province, Northern Madagascar
Dietmar Schwarz, Jan Kanis, and Karl Schmetzer
Pre-Columbian Gems and Ornamental Materials from Antigua, West Indies
A. Reg Murphy, David J. Hozjan, Christy N. de Mille, and Alfred A. Levinson
Gem Quality Ha¸yne from the Eifel District, Germany
Lore Kiefert and H.A. H‰nni
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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