All the allotropic forms of carbon, i.e., diamond, graphite and carbine, find applications in different areas of medicine, but diamond is specifically preferred. The unique properties of thin diamond layers, due to the highest biocompatibility of carbon resulting from the presence of this element in human body, make them candidates for producing biomaterials. Especially carbon in the form of a nanocrystalline diamond film has found industrial applications in the area of medical implants. Diamond Powder Particles (DPP), as an extended surface NCD, are useful for medical examinations. Different medical implants are covered with Nanocrystalline Diamond Coatings (NCD). NCD forms a diffusion barrier between implant and human environment.