Natural and artificial synthetic single crystal diamond is generally classified according to product applications, they can be used as cutting tools, grinding machine and drawing dies. They are designed to be used for surface finish, geometry and size are precision machining applications demanding. The surface of single crystal diamond cutting tool was continuous, and the surface of polycrystalline diamond cutting tool showing a micrometer discontinuous state, the status of the workpiece surface is more or less the grain size of the diamond tool materials related, although precision characteristics of the workpiece and the cutting tools need to be seriously considered, but there is a general principle that requires metal surface finish better than 0.025μm circumstances required of single crystal diamond tools and machining tools have high rigidity and high-quality stand .