AGTA, ICA Agree on Corundum

The American Gem Trade Association and the International Colored Stone Association have agreed to make the following declaration in regard to the new treatment of corundum that originated in Thailand. "Given the continued use of this process and the resulting confusion as to its disclosure," said a statement from the two groups, "our Associations have found it is necessary to provide absolute clarity regarding its description. We recommend this process be called a bulk diffusion process. "This process involves the addition of foreign elements at temperatures well above those used in the traditional heating process to create and/or induce the color alteration. Depending on the depth of the color alteration, the color may be removed by repolishing or chipping of the stone. "The accurate disclosure of this process is of vital importance to ensure the integrity of our industry and for th

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