Early in 2012, NGTC labs in Shenzhen and Beijing investigated some naked and embedded diamonds which included some undisclosed CVD synthetic diamonds. It was found that these gem-quality CVD synthetic diamonds are difficult to distinguish from natural diamonds by normal micro-scopic observation. However, they can be effectively identified with the help of some advanced ana-lytical techniques, such as PL(Photolumineseence) and DiamondView^TM. The experiments show that the line at 737 nm in the PL spectrum and the bluish green fluorescence, the blue phosphores-cence together with characteristics of multi-layered structure in DamondViewTM are the characteris-tics of these CVD synthetic diamonds.