Hänni Addresses Bulk Diffusion

Sapphires subjected to the bulk diffusion treatment developed in Chanthaburi, Thailand, had levels of beryllium far higher than natural or traditionally heated sapphire, according to research conducted by Dr. Henry A. Hänni, director of the SSEF Swiss Gemological Institute in Basel, Switzerland. Beryllium levels were noticeably higher at the gem's outer edges, but even the center of the stones showed levels of beryllium not found in unheated sapphires. (The beryllium comes from rough crystals of chrysoberyl, which are heated with the sapphire.) Hänni, who presented his research results in Chanthaburi, says, "I felt it was important to present these findings here first, as this is where this development is taking place." The Bangkok Post reported that "the Gem and Jewellery Institute of Thailand conducted its own research while the Thai Gem and Jewellery Traders' Association (TGJTA) h

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