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HPHT stands for high pressure, high temperature and is one of the primary methods used to grow diamonds in a lab. This diamond growth process subjects carbon to extreme temperatures and pressures and is meant to replicate the extreme heat and pressure conditions deep within the earth where natural diamonds form. HPHT diamonds are one type of lab-grown diamond, where the nitrogen atoms are in large even-numbered aggregates; these impart a yellow to brown tint.

In today’s diamond market, there are a variety of shapes and sizes of diamonds available to choose from, and melee lab grown diamond is one of them. Melee diamonds are shinny and tiny diamonds used in jewelry and that is what makes the halo and pave settings so alluring.