Characterization and identification of gem quarity CVD synthetic diamonds

Abstract

The procedure for CVD diamond synthesis has dramatically improved recently therefore, establishment of identification criteria as well as definite information disclosure is strongly required in the jewellery market.
Recently, 8 CVD synthetics over one carat were submitted to the Central Gem Laboratory for diamond grading.
These were the largest undisclosed samples of CVD synthetic diamond ever submitted a gem laboratory. It was found that these gem-quality CVD synthetic diamonds are difficult to distinguish from natural diamonds using only standard identification techniques and procedure, but they were effectivelyidentified using PL and UV luminescence techniques.