How are Lab-Grown Diamonds made?

Lab-Grown Diamonds are made in two methods:

1. High Pressure-High Temperature (HPHT)

Lab-Grown Diamonds are produced by placing 40-70 pieces of diamond seeds (ensured that there are no cracks) inside a “Greenhouse”.
The plasma ball of hydrogen ball is created inside the chamber. A small amount of methane is added which slowly turns into carbon and hydrogen. Thus, the formed Carbon is deposited on the seeds building the diamond.
A pressure of about 1.5 million pounds per square inch is exerted by using a belt press/cubic press/split-sphere (BARS) press.
The diamond is then heated to a temperature of above 2,500 degrees celsius.
A small diamond is then formed around the former diamond seed due to the extreme pressure and temperature conditions developed.

Chemical Vapor Deposition (CVD)

Diamonds are produced by placing a small slice of diamond seed in a closed chamber and heated until
the internal chamber temperature reaches 1000 degrees celsius approximately.
By heating ultra-rich carbon gases like methane in the controlled chamber, the carbon atoms in the gas begin to separate.
Upon separation the carbon atoms fall onto the diamond seed, building up layer-by-layer until they form coarse CVD diamonds.

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