
A Chinese HPHT press can grow a one-carat diamond chemically identical to a mined stone in about two weeks — and it collapsed a price the cartel defended for 137 years
Inside a Chinese cubic press, graphite is squeezed at 50,000 atmospheres and 1,500 degrees Celsius for two weeks, producing a one-carat diamond chemically identical to a mined stone — and collapsing a price the De Beers cartel had defended since 1888.














