In recent years, the producers and users of diamond pay more and more attention on its thermal stability (TS). Both British Element Six (former De Beers) and American GE make great effort on test and study of the thermal stability of diamond products. The TS of diamond is made as an important evidence for ascertaining the application field of diamond abroad. Now, the property assessment of diamond products has not been limited on test of strength, hardness, wear resistance, etc. but is a comprehensive estim...