RAPAPORT... The Gemological Institute of America (GIA) recently graded what it claims to be the largest known synthetic diamond created using chemical vapor deposition (CVD).The stone, produced by Shanghai Zhengshi Technology, is a princess-cut, 16.41-carat, G-color, VVS2-clarity lab-grown diamond, GIA said Wednesday. Spectroscopic readings the GIA performed confirmed the stone had no post-growth ...
