CVD Process is used to create gem quality diamonds.CVD process uses ultra pure rich carbon gases in a controlled environment/chamber.
Low-pressure CVD (LPCVD)
Ultrahigh vacuum CVD (UHVCVD)
Plasma-enhanced chemical vapour deposition (PECVD)
Microwave Plasma Vapour Deposition (MPCVD)
In HPHT the machines have the ability to build up the pressure of almost 60,000 atmospheres and temperature of 2,500°C.It contains all the elements that are needed to grow a diamond. It includes a tiny diamond seed, highly refined graphite and a catalyst mixture containing metals and powders. The catalyst inside react to added heat and pressure resulting in molten form.
The molten catalyst solution causes the graphite (carbon) to dissolve. After this the cooling process takes place. It requires a controlled environment to produce a gem quality diamond.
High Pressure is created by using two high strength pistons which provide equal pressure in opposing directions.
This technique uses many pistons that provide pressure from many different directions.
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