- Feb 17, 2013
The gemologist whom is has recently retired, and a trained and certified GIA gemologist of several decades said that he was not aware of any labs other than the main GIA or main GRS labs having the multi-million dollar equipment to test for heat treatment (but I will check with the AGL to confirm so I know where to send customers, although, again, we just assume heat treatment). Gemologists can see evidence of heat vs non heat treatment, but they cannot make that determination unequivocally. Hence we wrote this blog: https://pristinegemstonejewelry.com/blogs/blog/non-heat-treated-sapphires-by-pristine-gemstone-jewelryAGL can test for diffusion (heat, as far as I know, can be determined with standard gemologist equipment). I’ve sent a sapphire there and they had to utilize an LA-ICP-MS to test it. I would imagine SSEF has complete ability to test for diffusion as well. These four labs are the most highly regarded labs in the world (SSEF, AGL, AGL and GRS).