The definitions of industrial diamonds and gem-grade diamonds are based on natural diamonds produced by diamond mines, and diamonds with good quality are used in diamond embryos, that is, gem-grade diamonds; Those of poor quality that cannot be used as gems will be used for industrial purposes, that is, industrial diamonds.

Diamond synthesized by CVD is synthesized by natural diamond and a large amount of gas under specific pressure and temperature environment for a long time. Synthetic diamonds, including HTHP method and CVD method, are limited to the laboratory stage, have not been widely used in industrial applications, and have not entered the jewelry market. Because synthetic diamonds and artificially processed diamonds have unique characteristics, these diamonds will be distinguished by professional personnel and instruments, so diamonds with certificates on the market can be considered as natural diamonds.