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IGI grades largest and multicolored LGDs


The International Gemological Institute (IGI) recently analyzed and graded a polished lab-grown diamond over 50 carats—the largest on record—as well as another novelty, a multicolored lab-grown.


The 50.25 ct. diamond, named “Shirpa,” is a type IIa emerald cut measuring 22.95 x 18.45 x 11.57 mm, with G color, VS2 clarity, and excellent cut, polish, and symmetry. It was grown and polished over a period of six months by Mumbai-based Ethereal Green Diamond, using the chemical vapor deposition method.


IGI says this recent discovery was the first to pass the “half century” benchmark in carats. In May, GIA had graded a 34.59 ct. emerald-cut CVD-grown diamond, which was the biggest diamond that lab had ever seen.


In addition, IGI has analyzed a piece of 10.96 ct. rough and a 4.38 ct. lab-grown diamond that display color zones of both blue and yellow.


The diamonds were grown using high pressure high temperature (HPHT) by Meylor Global, a Ukrainian company that created the multicolored gems in honor of the country’s blue-and-yellow flag.



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