John M. King, James E. Shigley, Thomas H. Gelb, Scott S. Guhin, Matthew Hall, and Wuyi Wang
Emeralds from the Kafubu Area, Zambia
J. C. Zwaan, AntonÌn Seifert, Stanislav Vr·na, Brendan M. Laurs, Bjˆrn Anckar, William B. Simmons, Alexander Falster, Wim Lustenhouwer, Sam Muhlmeister, John I. Koivula, and HÈja Garcia-Guillerminet
Mt. Mica: A Renaissance in Maine's Gem Tourmaline Production
William B. (Skip) Simmons, Brendan M. Laurs, Alexander U. Falster, John I. Koivula, and Karen L. Webber
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