GIA: Synthetic Stone Fraudulently Inscribed To Match Natural Diamond Report

Improvements in diamond growth technology and methods have led to a noticeable increase in colorless synthetic gem diamonds in recent years, reported the GIA.

Concerns in the diamond industry focus on laboratory-grown diamonds not being properly disclosed or even being sold as natural stones. Through careful examination and analysis, gemological laboratories can separate natural from synthetic diamonds. Occasionally, however, fraud is involved in attempting to conceal a gem’s identity. The Carlsbad laboratory witnessed such an attempt.

A round brilliant cut was submitted for an updated diamond grading report. Its girdle was inscribed with an actual GIA report number issued in 2015. The older report was for a natural, untreated diamond and contained the following grading information: 1.74 ct, round brilliant cut, D color, Excellent cut grade, and VVS1 clarity.

Upon grading, the new submission was described as a 1.76 carat round brilliant cut with F color, Excellent cut grade, and VS1 clarity. Moreover, its screening processes determined that the newly submitted sample needed additional testing to determine its origin. This examination revealed it to be an HPHT-grown synthetic diamond. Synthetic cuboctahedral growth structure and phosphorescence were clearly visible in DiamondView imaging.

"While most synthetic diamonds that come to the laboratory are properly disclosed, some are submitted out of concern that a stone presented as natural might be synthetic. Rarely do we encounter the type of blatant fraud described here. It is important for the industry and public to exercise caution, because these types of misleading practices do occur. We believe the submitting client noticed inconsistencies with the GIA report information and sent it to the lab for an updated report. If any doubt exists or some aspect of a diamond (such as an inscription) seems odd, the stone should be sent to a gemological laboratory for verification."