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HTPT Natural Diamonds


Lab-grown diamonds are generally produced by two main methods, considered to be the very best in the industry: chemical vapour deposition (CVD) or high-pressure, high-temperature (HPHT) methods. Using the best of technology at Classic Green, we ensure that every diamond we manufacture is 100% pure, while being eco-friendly at the same time.

A CVD ("Chemical Vapour Deposition") diamond grown by microwave plasma technology is the highest-quality diamond, though it’s man- made, with properties equal to or better than natural diamonds. They are grown in a highly-controlled environment, using advanced technical processes that replicate the natural method of diamond formation.

On the other hand, HPHT puts a pure, solid carbon source under high pressure and high temperature. In the presence of a catalyst, the pressurized and heated carbon crystalizes into a diamond. HPHT is sometimes used to improve the colour of mined or lab-grown diamonds.


Every diamond grown by us has been analysed and graded by either the Gem Certification and Assurance Lab (GCAL) or the International Gemological Institute (IGI). These two laboratories are among the most respected laboratories in the diamond industry, and are known for their consistency and unbiased diamond grading systems. With this certification, you can rest assured that our diamonds will display the same physical, chemical, and optical characteristics as natural diamonds, and exhibit the same fire, scintillation, and sparkle.

At the same time, these diamonds will also be 100% eco-friendly and conflict-free, while being cost-effective at the same time.

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