Schematic of the belt press While in the HPHT process, you will discover 3 principal press patterns used to supply the pressure and temperature required to make artificial diamond: the belt press, the cubic press plus the split-sphere (BARS) press. Diamond seeds are positioned at the bottom of the press. https://fernandowdmth.ampedpages.com/the-2-minute-rule-for-lab-grown-diamonds-are-the-future-54651851