Host: The Gemmological Society of Japan
Pages 7
The production technology of the synthetic diamond is progressing rapidly today. Inspecting services separate TypeⅡ diamonds from TypeⅠ to which most of the natural diamonds belong, and then distinguish among the former type the natural stones from the synthetic ones by means of examining machinery and tools.
This time we examined two round brilliant diamonds weighting 0.135ct and 0.140ct through FTIR, Vis-NIR, PL spectroscopy and Diamond-view imaging, and came to the conclusion that both of them are CVD synthetic diamonds. These stones showed the pink-to-blue color change after applying ultraviolet rays and 946nm (SiVO center) of Vis-NIR. We will do the comparative examinations with other examples of colorless to near-colorless CVD synthetic diamond.
