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EGL USA discovers tool to identify HPHT-treated diamonds

April 06, 2009

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New York--EGL USA has discovered the first visual observational criteria for identifying high-pressure, high-temperature treated (HPHT) diamonds, the lab announced recently.

According to a press release, the indicator, the "fluorescence cage," is a specific luminous, intersecting pattern along the cut edges and vertices of facets on particular colored HPHT-treated Ia diamonds with less than strong fluorescence.

The effect can be seen with a fluorescence microscope, and early results indicate that the effect is the result of the movement of optically active impurities triggered by the HPHT process.

Dr. Inga Dobrinets of EGL USA, along with Professor Alexander Zaitsev of the College of Staten Island/CUNY, completed the research to identify the cage.

"The visual observation of a fluorescence cage appears to be the most reliable feature used so far for the reporting of HPHT treatment," Dobrinets said in a media release. "A significant advantage of the cage-based identification is its comprehensive fidelity and technical simplicity. While the 'cage effect' may not appear on all HPHT-treated stones when it is evident, a conclusive identification can be made on that basis alone."

EGL USA Director Mitch Jakubovic said that in the coming months, the lab plans to use this breakthrough to provide HPHT identification in a more efficient and cost-effective way.

"At EGL USA, we always combine the best in science and service. This discovery, particularly the observational aspect, is a key example of that," he said.

According to the release, EGL USA will continue to research the cage effect, with final findings set for inclusion in a formal paper.
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