HPHT High Pressure High Tempature Color Treatment | Lighten or Intensify

Watch for this laser inscription which would indicate a General Electric/Pegasus Overseas Limited treated diamond. In addition GIA has adopted a policy of inscribing all discovered HPHT and irradiated diamonds submitted for reports.

General Electric and LKI (Lazare Kaplan, Inc.) developed the method of HPHT (high pressure high temperature) to lighten or intensify color in natural diamonds — type IIa browns — trademarking it “Bellataire” (formerly Pegasus). This newest scare and sensation has many people in the business concerned, due to its non-detection by several labs in the U.S. to which LKI submitted their newest treatment. The subsidiary POL (Pegasus Overseas Limited), owned by LKI, has promised to laser inscribe the girdle of every Bellataire diamond for obvious identification. Of course this can be easily removed, either inadvertently during the process of a re-cut, or on purpose to deceive the unwary buyer.

Other manufacturers are getting into the production of HPHT diamonds, so it’s inevitable that these types of treated diamonds will eventually appear in your business. The likely standard in detection methods will eventually involve spectrophotometer and photoluminescence analysis. Being informed on these methods is the best way to combat the possibility of fraud. The “Lovelady Diamond” newslettter will keep you informed of the latest detection.

During the Covid-19 crisis we are still serving the public with safeguards. At this time it is by appointment only Monday-Saturday so feel free to contact us by calling (408)358-5336, texting to (408)455-9885 or email to Stay safe and wash your hands often!

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