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The PDF version of this issue is available at no charge. Visit www.gia.edu
Global Rough Diamond Production since 1870
A.J.A. (Bram) Janse

Durability Testing of Filled Emeralds
Mary L. Johnson

Continuity and Change in Chinese Freshwater Pearl Culture
Doug Fiske and Jeremy Shepherd

Yellowish Green Diopside and Tremolite from Merelani, Tanzania
Eric A. Fritz, Brendan M. Laurs, Robert T. Downs, and Gelu Costin

Polymer-Impregnated Turquoise
Kyaw Soe Moe, Thomas M. Moses, and Paul Johnson

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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