Blesq Diamonds
3 February 2020

HPHT Procedure

We’d like to share our passion and expertise for diamonds with you, which is why we’ve created the Blesq diamonds blog – read on for gripping tales and exciting news about the most precious gemstone on Earth.

The High Pressure – High Temperature Treatment is a way to produce synthetic diamonds with high clarity inside a steel chamber under a pressure of approximately 60,000 bar and temperatures of over 1500 °C.

If the creation of a diamond took place within the depths of the earth thousands of years ago, diamonds can now be produced in a few weeks using the HPHT process. For the first time in 1954, the American company General Electric was able to produce small diamonds using the HPHT process. Synthetic diamonds with more than 2 carats are being produced, but these have missed the emotional component of Earth’s forces.


A natural diamond is a legacy of our world history. Let our Blesq experts advise you on a unique specimen from the depths of the earth.