CIBJO releases Gemmological Report
CIBJO
Gemmological Commission Special Report surveys
Gem
labs about synthetic and treated diamond reports
With
fewer than four weeks to go to the opening of the 2018 CIBJO Congress in
Bogotá, Colombia, on October 15, 2018, the sixth of the CIBJO commissions'
Special Reports has been released. Prepared by the CIBJO Gemmological
Commission, headed by Hanco Zwaan, it reveals the results of a 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," wrote
Mr. Zwaan. "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.
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