Researchers from the Gemological Institute of America (GIA) anticipate a surge in large high-pressure, high-temperature (HPHT) synthetic diamonds to be introduced into the jewellery industry.
This follows a visit in early March 2016, where the researchers visited a diamond factory in China and obtained 50 crystals ranging from 0.5 to 1.2 carats. “All of the crystals – which were examined using the same instrumentation and techniques applied to diamonds submitted to GIA for grading – exhibited the typical characteristics of HPHT growth and were identified as synthetic. The crystals were basically colorless, with only a few metallic inclusions observed,” it says.
The GIA reported on its website, that: “High-pressure, high-temperature (HPHT) technology for gem diamond synthesis has made rapid progress in the last few years. It is now being used to produce many melee-size diamonds around 2 to 3 mm in diameter and large colorless single crystals, all with significantly improved quality and growth rate. One Russian company is reportedly growing multiple large, gem-quality colorless diamond crystals in a single run. Here we report on large diamond crystals manufactured using a similar technology by Jinan Zhongwu New Materials Co. Ltd in Shandong, China.”
While the GIA reports that the total production volume remains unclear, it believes it to be “significant”, and that “capacity is likely to expand in the near future”.
This strongly suggests that even more large HPHT synthetic diamonds will be introduced into the jewellery industry. The full article can be read here.