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How Synthetic diamonds are made?

Mason Martinez

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They are made from carbon (plus, depending on desired size and colour, some nitrogen or boron) - same as natural diamonds.

There are two basic methods of manufacturing that are commercially mature:

High Pressure/High Temperature (HPHT), where graphite is subjected to very high pressures and temperatures and re-crystallises as diamond, possibly with the help of a "seed" diamond crystal

Carbon Vapour Deposition (CVD), where carbon is vaporised in a vacuum chamber and allowed to deposit itself over a pre-existing (very small) diamond substrate, growing it into a larger crystal

There are also very small diamonds being experimentally created using micro-explosions or magnetostriction/piezoelectric effects, but at the moment diamonds produced with these techniques are not usable for jewellery purposes (aside from production cost and reliability, they are just too small).

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