(IDEX Online) - A 14.60-ct diamond has been certified as the largest polished lab grown gem produced by the CVD process.The F/VVS2 stone was made by Ethereal Green Diamond, in Mumbai, India, and graded by the IGI lab.Last November, the Chinese manufacturer Shanghai Zhengshi Technology claimed a CVD record with a 12.75-ct F/VVS2.Before that, in June 2020, the GIA lab in Carlsbad, California, graded a 7.07-ct M/VS2 stone. Chemical vapor deposition (CVD) is a newer method of producing lab-grown diamonds. It does not require high pressures like the longer-established HPHT (high pressure, high temperature) process.Pic of the 14.60-ct CVD lab grown, courtesy IGI