11 December 2017
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GIA LAB FINDS SYNTHETIC DIAMOND INSCRIBED WITH REPORT NUMBER OF NATURAL DIAMOND
19 November 2017
The Gemological Institute of America (GIA) has published a report in the latest issue of the organization's periodical Gems & Gemology, which details the discovery of a synthetic diamond, inscribed with a GIA report number belonging to a natural diamond. The synthetic diamond was reportedly submitted as a natural diamond to the GIA lab in Carlsbad for re-evaluation, and subsequently found to be synthetic.

The report on the incident was prepared by senior research scientist Christopher M. Breeding, and GIA senior staff gemologist Troy Ardon.

Says the report: "On this occasion, 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 ct round brilliant cut with F color, Excellent cut grade, and VS1 clarity. Moreover, our 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."

The report's authors urge that, "...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."
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