On January 27 2022, GIA released a report examining and grading a 16.41-carat lab-grown
synthetic diamond, produced by using chemical vapor deposition (CVD) method. This is the new
record size for CVD laboratory-grown diamond, revealed in the GIA report. This 16.41-carat
princess-cut synthetic diamond, produced by Shanghai Zhengshi Technology Co. Ltd.,
measures 13.97 × 13.87 × 9.56mm, G color, and has a clarity of VVS2. It has been confirmed by
GIA that there is no further treatment to improve its color after production.
With the rapid development of diamond technology in recent years, two methods of high
temperature, high pressure (HPHT) and chemical vapor deposition (CVD) are most commonly
used to produce synthetic diamonds. Quality and size of synthetic diamonds are getting much
larger and better, which often leads to constant record breaking.The previous record was set in
2021, an emerald-cut 14.60 carat CVD synthetic diamond, produced in India, revealed and
announced by the International Gemological Institute (IGI). The current record holder of the
largest synthetic diamond in any kind of method is a cushion-cut 20.23-carat synthetic diamond
produced by HPHT method, with the color of Fancy Vivid Yellowish Orange and clarity of VS2
produced in 2019.