Academic view of synthetic diamonds for jewelry

Abstract Background: The total reserves of diamonds on the earth are about 2.5 billion carats, of which about one-fifth is gem-grade. Now the annual mining volume is about 100 million carats, so after a few decades, natural diamonds will be mined. . High temperature and high pressure HPHT method and chemical vapor deposition CVD method...
background:
The total reserves of diamonds on the planet are about 2.5 billion carats, of which about one-fifth is gem-quality, and now the annual mining volume is about 100 million carats, so natural diamonds will be exhausted after a few decades. The high-temperature high-pressure HPHT method and chemical vapor deposition CVD method for the synthesis of diamonds are perfect, the popularization of identification technology, and the mature market access path will gradually fill the gap in the natural diamond market. There are 7,000 six-face presses in use in China. After nearly 20 years of improvement, the growth effect of the six-face press has exceeded the pressure belt press used in Europe and America, and the separation ball (BARS) pressure from Russia. Machine and two-sided concave press. The existing six-sided top press for growing diamond abrasives can grow gem-quality colorless rough diamonds with a slight improvement, and the size can be from one millimeter to ten millimeters, and the finished diamonds for jewelry of half to ten carats are ground. The new diamond technology company in St. Petersburg, Russia, uses the six-face press from China to produce the DEF color, IF, VVS clarity, 1 carat to 10 carat weight.
Key words : synthetic diamond; HPHT; seed temperature difference method; thin film method; CVD
Guide:
Classification of diamonds on the market:
CVD synthetic diamonds:

The picture on the left is a colorless CVD diamond; the picture on the right is a pink-purple CVD diamond.
Since the maturity of CVD synthetic diamond technology in 2012, it has been launched in the global market because of the difficulty of identification, resulting in the impact of natural diamonds.
The CVD method is only suitable for medium, large and super large diamonds of jewellery, and the cut scraps are barely made of small drills, and the industry has excellent prospects.
The production technology of CVD synthetic diamonds is extremely high. So far, dozens of research institutes and manufacturers around the world are working hard, and only a few can be produced commercially.
HPHT synthetic diamonds:

Russian HPHT produces 10.02 carats of E/VS1 synthetic diamonds


Production of colorless small diamond products and rough stones by HPHT seed crystal temperature difference method
The exploitation of natural diamonds will destroy the global environment, consume a lot of resources, have ethical problems of “blood diamonds”, and have high prices. Synthetic diamonds grow in the laboratory as a green operation, do not destroy the ecology, use limited energy, and have no blood diamonds. The price is much lower than that of natural diamonds, which can attract consumers to buy. (This article is taken from the Proceedings of the 19th China Superhard Materials Technology Development Forum, "Development and Future of Synthetic Diamonds for Jewelry")

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