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CIBJO’s Special report looks at issues related to nomenclature and identification
The topic will be discussed at the forthcoming CIBJO Congress
By: Diamond World News Service
Apr 11 2015 4:50PM
Reference: 11360  

CIBJO Commissions has released Special Reports, which will focus on issues related to nomenclature and identification, and in particular how these have contributed to alleged inconsistencies in the results reported by different laboratories. The report will be taken up for discussion at the CIBJO Congress slated in Brazilon on May 4, 2015.

The Report is prepared by CIBJO Gemmological Commission, headed by Hanco Zwaan. Although it is recognized that laboratories may differ in their approaches and opinions on the wording used on reports, it should be recognized that work has already been done in harmonizing methods and nomenclature, in the CIBJO Blue Books and in the sheets produced by the Laboratory Manual Harmonization Committee (LMHC), Mr. Zwaan writes.

The Special Report also relates to the pressures placed on laboratories to grade gemstones using commercial terms, like “pigeon blood red” for rubies and “royal blue” for sapphires. “The objective is to find common ground and ways to move forward to formulate standards in this area that can be widely accepted and used,” Mr. Zwaan notes.

Also, according to Zwaan, the discussions on opal and hydrophane treatments which took place at the Moscow Congress, and how the Commission is working with the LMHC to finalise a sheet recommending how hydrophane should be reported. Other issues that will be discussed include -Standardization and communication of ruby and sapphire colours, Formulation of standard usage of commercial terms (eg colour descriptive terms such as ‘pigeon blood red’ and ‘royal blue’) on gemmological reports, Clarifications regarding the name ‘Organic Ruby’ being used to decribe lead-glass filled ruby that are surface-only lead-free products, The tanzanite nomenclature in the blue book, Concerns raised by enhancement of emeralds, applied after certification. The Report also noted that a brief update on the progress made by LMHC has made further harmonising laboratory nomenclature.

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