Hardness test lab report pdf is a featured article. Click here for more information. The first reproducible synthesis was reported around 1953. Those two processes still dominate the production of synthetic diamond.
In this process, nanometer-sized diamond grains are created in a detonation of carbon-containing explosives. Both CVD and HPHT diamonds can be cut into gems and various colors can be produced: clear white, yellow, brown, blue, green and orange. The molten iron was then rapidly cooled by immersion in water. The contraction generated by the cooling supposedly produced the high pressure required to transform graphite into diamond. Moissan published his work in a series of articles in the 1890s.
Many other scientists tried to replicate his experiments. Despite the claims of Moissan, Ruff, and Hershey, other experimenters were unable to reproduce their synthesis. Moissan and Hannay, but also adapted processes of his own. He wrote a number of articles—some of the earliest on HPHT diamond—in which he claimed to have produced small diamonds. However, in 1928, he authorized Dr. Norton and Carborundum companies to further develop diamond synthesis.