CVD diamond does not contain any metal catalyst, so its thermal stability is close to that of natural diamond. Like high temperature and high pressure synthetic polycrystalline diamond, CVD diamond grains are also disordered and have no brittle cleavage plane, so they are isotropic. CVD diamond is now used as a tool material.

Diamond tools have the advantages of extremely high hardness and wear resistance, low friction coefficient, high elastic modulus, high thermal conductivity, low thermal expansion coefficient, and small affinity with non-ferrous metals.

It can be used for precision machining of non-metallic hard and brittle materials such as graphite, high wear-resistant materials, composite materials, high silicon aluminum alloy and other ductile non-ferrous metal materials. There are many types of diamond cutting tools, and the performance difference is significant. The structure, preparation method and application field of different types of diamond cutting tools are quite different.