The CIBJO Gemmological Commission will be discussing how the jewellery industry can achieve greater consistency and clarity in the nomenclature that is used to describe various types of diamonds and gemstones, especially in grading reports, at the forthcoming 2018 CIBJO Congress to be held in Bogotá, Colombia, on October 15, 2018.
A report prepared by the Commission, headed by Hanco Zwaan, has revealed the results of a recently conducted online survey of 23 gemmological laboratories from around the world, about whether and how they report on synthetic and treated diamonds.
“The survey provided a clear picture of the similarities and differences on the reports issued by the various laboratories, and perhaps also suggested the requirements and preferences of different markets around the globe,” Zwaan writes. “Overall the nomenclature used by laboratories is clear about the nature of the stones described, but there are inconsistencies with regard to the precise terms used, and whether or not grading of synthetic and/or treated stones is permitted.”
The special report also provides details about a document prepared by the Gemmological Commission, which it intends will come to serve as a reference point for the industry in the way that it deals with commercial colour terms such as “pigeon blood red” and “royal blue.” Other subjects discussed include how professional opinions can or should be presented separately on laboratory reports, and the necessary standards for governing the use of varietal names for different gemstones.
News Source: gjepc.org