The Worldwide Gemological Institute (IGI) and the Gemological Institute of America (GIA) labs have not too long ago examined the most important lab-grown diamonds they’ve ever seen grown with the high-pressure, high-temperature (HPHT) and chemical vapor deposition (CVD) strategies.

In January, the IGI introduced it had seen a record-setting lab-grown blue crystal piece of tough (proven at high), which weighs 150.42 cts. and measures 28.55 mm x 28.25 mm x 22.53 mm. That is believed to be the most important lab-grown diamond ever produced.

It additionally noticed a second grey crystal weighing 141.58 cts. that measures 28.9 mm x 28.5 mm x 20.75 mm.

“The acceleration of expertise within the lab-grown diamond sector is important,” mentioned IGI senior director of training John Pollard in an announcement. “Along with record-setting weights, they’re sort IIb crystals, a semiconducting class related to diamond-based electronics.”

Each diamonds had been grown in Ukraine with HPHT by Alkor-D, a subsidiary of Meylor International. Meylor had set the prior file for the world’s largest lab-grown diamond, which weighed 115 carats.

Finally 12 months’s JCK Las Vegas present, Meylor International CEO Yuliya Kusher instructed JCK her firm was engaged on a 200 carat diamond.

“I don’t suppose CVD can try this,” she mentioned. She added that whereas most Chinese language producers use HPHT, “they’re making a number of melee, [not even] 1 ct.”

Meylor International is the official distributor of diamonds created by New Diamond Expertise, the grower based mostly in Russia identified for producing record-setting diamonds. It’s owned by Ukrainian nationwide Timur Mindich.

As well as, the GIA not too long ago examined the most important identified polished lab-grown diamond it has ever seen produced by CVD.

The 16.41 ct. princess-cut diamond was grown with the CVD technique by Shanghai Zhengshi Expertise Co., which has been engaged on CVD expertise since 2002.

The diamond evidenced no post-growth remedy and was graded G coloration, VVS2 readability, GIA mentioned.

“The primary CVD diamond I examined in 2003 was a 0.23 ct. pear form, with clear brown coloration,” mentioned Dr. Wuyi Wang, GIA vice chairman of analysis and improvement, in an announcement. “This 16.41 ct. laboratory-grown diamond demonstrates the advances in CVD progress expertise.”

Most U.S.-based firms, together with WD Lab Grown and Diamond Foundry, in addition to Indian firms, develop diamonds utilizing the CVD technique.

Prime: The 150 ct. lab-grown diamond (photograph courtesy of Worldwide Gemological Institute)

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