Large lab-grown diamond deception revealed Posted June 18, 2021 | By Arabella Roden ⢠Editor The International Gemological Institute (IGI) has determined that a 6.18-carat round brilliant cut diamond, which had been submitted for grading as natural, was lab-created. The loose stone was analysed at IGI’s Bangkok laboratory, and was accompanied by a report from the Gemological Institute of America (GIA) stating it was a natural diamond. "This is the largest lab-grown diamond ever certified by a leading gemological laboratory, where the sole purpose was to pass off a lab-grown st...