Lab Identifies First Synthetic Diamond over 1-Carat
Post Date: 07 May 2010 Viewed: 585
The Gemological Institute of America announced that it has identified, for the first time, a near-colorless CVD-grown diamond larger than a carat.
According to Jewelry & Diamonds, the diamond was submitted to the GIA for grading, as single-crystal CVD synthetic diamonds sometimes are.
The 1.05-carat, pear shape diamond was color-graded as equivalent to G. In addition to pinpoint inclusions, it contained some feathers and fractures along the girdle, and its clarity grade was equivalent to I1, said the GIA Laboratory in New York.
The report added that no fluorescence was observed when it was exposed to conventional long and short UV waves. The infrared absorption spectrum indicated that the sample was type IIa.
Images taken with the DiamondView, which employs strong ultra short-wave UV radiation, showed strong orange-red fluorescence with some irregularly shaped regions of blue fluorescence.