Thai Gem Treaters Dispute Labs

The Chanthaburi (Thailand) Gem and Jewelry Association (CGJA) met with local gem heaters on June 8 to develop a response after two major gem labs—the American Gem Trade Association's Gem Testing Center (AGTA GTC) and the Gemological Institute of America's Gem Trade Laboratory (GIA GTL)—decided to add the term "bulk diffusion" to descriptions of the new heat-treated yellow and padparadscha-like sapphires coming out of Thailand. Following the daylong meeting, CGJA announced that it disputed the findings of the four international labs at the forefront of the controversy—AGTA GTC, GIA GTL, Gübelin Gem Lab, and SSEF. Although Gübelin and SSEF call the new enhanced gems simply "treated sapphire," CGJA accused all four labs of describing the new heat-treated material with "unjust criticism and hasty conclusions." CGJA says the four labs are "unqualified" to make these identification

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