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Technology HPHT
Learn more about cultivated diamonds


HPHT Method — High Pressure High Temperature (HPHT)

The method itself was developed in the middle of 1950s and has since been modified by various research laboratories specializing in diamond synthesis around the world. The highest quality lab-made diamonds are grown using variants of this method; the most successful involves growing the diamonds in a 'flux' of molten metal alloy.

HPHT method recreates the actual geological conditions that occur 150 km deep in the Earth's mantle. The conditions are a unique and powerful combination of extreme pressure (up to 60,000 atmospheres) and very high temperature (up to 2,500°C), which are the natural conditions for diamond formation.

The equipment itself is known as 'split sphere' technology or 'BARS'. The machinery utilizes a built-in growth cell where the carbon seed of a crystal is placed and where extreme pressures and temperatures are applied. The atoms of carbon are transformed and grow into what is known as the hardest and most perfect substance found in Nature - the Diamond.

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