Standard tungsten-cobalt carbide bonds, depending on their hardness and purpose, are produced by cold (No. 3, 20-25 HRC, and No. 4, 30-35 HRC) and hot (No. 5, 50-55 HRC) pressing methods. Temperatures of sintering of bond-matrixes vary in the range from 1150 (No. 3) to 1350°C (No. 5) and in a reducing medium do not lead to the appearance of noticeable traces of graphitization. or loss of mechanical strength in perfect single crystals of natural diamond.