John M. King, Ron H. Geurts, Al M. Gilbertson, and James E. Shigley
Rubies and Sapphires from Winza, Central Tanzania
Dietmar Schwarz, Vincent Pardieu, John M. Saul, Karl Schmetzer, Brendan M. Laurs, Gaston Giuliani, Leo Klemm, Anna-Kathrin Malsy, Eric Erel, Christoph Hauzenberger, Garry Du Toit, Anthony E. Fallick, and Daniel Ohnenstetter
The Wittelsbach Blue
Rudolf Drˆschel, J¸rgen Evers, and Hans Ottomeyer
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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