Natural color in a diamond comes from the presence of trace impurities in the stone or structural irregularities at its atomic level. Different elements trapped in the molecular structure cause color in natural diamonds e.g. blue diamonds are a result of the presence of boron in the diamond.

The HPHT Process recreates the high pressure and high temperature conditions that existed naturally within the mantel of the earth during the formation of the diamond to allow these different natural elements to relax and display their natural color. Highly sophisticated machines expose the diamond to heightened heat and pressure resulting in the change of color. During the process, a frosty layer covers the outer surface of the diamond. These diamonds need to be repolished to reveal their newly attained beauty. The main limitation of this process is the requirement of using very clean diamonds. Any small feathers in the diamond will result in worsening or even chipping out of the diamond during the exposure to high pressure.

Initially the primary colors made using HPHT were white, yellow, orange & green. Recently with the combination of both HPHT & Irradiation, we have been able to manufacture some pinks & purples in limited quantities.

Colors Manufactured by Lotus Colors using HPHT - Canary Yellow, Golden Yellow, Rose Pink, Purplish Pink & Purple.

Among the three processes, HPHT enhanced diamonds require the least care. They like all diamonds, are legendary for their hardness and durability, resistant to general wear and tear, and not subject to change over time. They require no special attention in daily use, and can also be subjected to high temperatures.