Numerous claims of diamond synthesis were documented between 1879 and 1928; most of those attempts were carefully analyzed but none were confirmed. In the 1940s, systematic research began in the United States, Sweden and the Soviet Union to grow diamonds using CVD and HPHT processes. The first reproducible synthesis was reported around 1953. Those two processes still dominate the production of synthetic diamond. A third method, known as detonation synthesis, entered the diamond market in the late 1990s. In this process, nanometer - sized diamond grains are created in a detonation of carbon - containing explosives. A fourth method, treating graphite with high - power ultrasound, has been demonstrated in the laboratory, but currently has no commercial application.
when was the first man made diamond made
around 1953