HPHT Diamonds

A HPHT diamond, meanwhile, is grown in a press machine. Again, this method begins with a diamond seed. The seed is placed in the machine and then placed under both heat and extreme pressure. This causes the carbon to melt and attach to the seed. And just like the CVD method, after a few weeks a diamond is formed. The process for making HPHT diamonds is closest to the natural process for making diamonds.


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