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Memorial diamond growth process
Memorial diamonds, also known as DNA diamonds or gene diamonds, are lab-grown diamonds infused with carbon extracted from a loved one’s hair or ashes. These carbon elements carry personal meaning, making each diamond unique. The extracted carbon is purified and carbonized into graphite, then placed into an HPHT press. Under conditions of high temperature (around 1500°C) and high pressure (5–6 GPa), and with the aid of metal catalysts, carbon atoms rearrange on a seed crystal to form a one-of-a-kind diamond.
Lab-grown diamond production diagram
Lab-grown diamonds are synthetic diamonds produced in laboratories by replicating the natural growth conditions of diamonds. They have the same chemical, physical, and optical properties as natural diamonds, differing only in origin.
HPHT (High Pressure High Temperature) is one of the main methods, using a cubic press to simulate Earth’s mantle conditions. Carbon sources like graphite are crystallized into diamonds using catalysts (such as iron or nickel) under extreme conditions.
HPHT diamonds typically feature better color (often D–E grade) and excellent clarity (VVS–VS).
Industrial diamond production diagram
China’s HPHT cubic press technology is highly advanced and well-suited for large-scale production of diamond grits, which are widely used in cutting tools and abrasives. These presses provide the high-temperature and high-pressure environment necessary for diamond synthesis. Under the action of iron- and nickel-based metal catalysts, graphite is transformed into diamond.
Henan Huanghe Whirlwind Co., Ltd. has independently developed its own HPHT cubic press technology. Leveraging this innovation, the company has become one of the top three global producers of synthetic diamonds, with a leading market share in the industry.
PDC cutter growth process
PDC is a superhard material made by sintering diamond micro-powder with a tungsten carbide substrate under HPHT conditions. It combines the extreme hardness of diamond (HV 8000–10000) with the toughness of carbide, making it ideal for oil & gas drilling, mining, and cutting tools. The quality of PDC largely depends on the stability and precision of the HPHT press during sintering. Accurate pressure and temperature control ensure strong bonding and superior performance of the final composite.
