![]() ![]() ![]() ![]() But under immersion, many displayed unusual orange color rims surrounding pink cores, suggesting there might be more to this than a simple bake job. When Scarratt examined his stones back in New York, he found that all had been exposed to high-temperature heat treatment. Pala International's Bill Larson also purchased samples in early December 2001 in Bangkok. The stones were to be marketed under new names, such as Sunset sapphire, etc.įollowing the author's email blast with the news provided him by Coldham, AGTA Lab Director Ken Scarratt visited Bangkok in December 2001 and obtained samples. Shortly thereafter, several other sources confirmed the news. His initial report was that a burner in Chanthaburi, Thailand had developed a new method to treat off-color Songea (Tanzania) stones to a fine orange to red-orange color. March 2002 – In October 2001, Australian gemologist Terry Coldham informed the author of a new treatment for orange sapphire. The early history of beryllium diffusion in sapphire, starting with the 2001 appearance of large numbers of padparadscha sapphires in the Thai gem market. ![]()
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