A superhard cutting element having a polished, low friction substantially planar cutting face with a surface finish roughness of 10.mu. in. or less and preferably 0.5 .mu. in. or less. A chamfered cutting edge and side surface of the superhard material table of the same surface finish roughness are also...http://www.google.com/patents/US5653300?utm_source=gb-gplus-sharePatent US5653300 - Modified superhard cutting elements having reduced surface roughness method of modifying, drill bits equipped with such cutting elements, and methods of drilling therewith
