Characterization and Grading of Natural-Color Yellow Diamonds
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, Björn Anckar, William B. Simmons, Alexander Falster, Wim Lustenhouwer, Sam Muhlmeister, John I. Koivula, and Héja 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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