In May 2015, the Shenzhen Laboratory of the National Jewelry and Jade Quality Supervision and Inspection Center found a large number of black dot-like and cloud-like inclusions in a batch of ruby jewelry diamonds, so the inspectors tested the samples by infrared spectrometer and ultraviolet-visible spectroscopy according to the inspection process of complex samples. The results of fluorescence observation, Raman scattering spectroscopy and photoluminescence spectroscopy showed that five of the diamonds in the ruby jewelry were high temperature and high pressure synthetic diamonds. Previously, seven batches of unspecified small grains of HTHP synthetic diamonds were found in the center's laboratory, suggesting that colorless HTHP synthetic diamonds have begun to enter the jewelry market.
In fact, synthetic diamonds are not a new technology. As early as 1953, Swedish Electric Company first successfully synthesized 40 small diamonds by high temperature and high pressure technology, but it was not publicly announced; in 1955, General Electric Company of the United States successfully synthesized small diamonds by static pressure coal melting method; in 1959, De Beers Company successfully synthesized diamonds by epitaxy growth technology. Since then, the synthetic technology of industrial diamonds has been widely used, and gradually began commercial production.