An element-doped diamond crystal is disclosed herein. The crystal includes at least one dopant element which has a greater concentration toward or near an outermost surface of the crystal than in the center of the crystal. The concentration of the dopant element is at a local minimum at least about 5...http://www.google.se/patents/US6887144?utm_source=gb-gplus-sharePatent US6887144 - Surface impurity-enriched diamond and method of making
