{"id":14210,"date":"2017-10-11T06:54:46","date_gmt":"2017-10-11T06:54:46","guid":{"rendered":"http:\/\/www.cibjo.org\/?p=14210"},"modified":"2018-05-22T10:23:24","modified_gmt":"2018-05-22T10:23:24","slug":"cibjo-releases-gemmology-commissions-special-report-looking-at-how-labs-should-act-when-evidence-of-treatment-is-not-definitive","status":"publish","type":"post","link":"https:\/\/cibjo.org\/rstoolkit\/cibjo-releases-gemmology-commissions-special-report-looking-at-how-labs-should-act-when-evidence-of-treatment-is-not-definitive\/","title":{"rendered":"CIBJO releases Gemmology Commission\u2019s Special Report, looking at how labs should act when evidence of treatment is not definitive"},"content":{"rendered":"
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October 11, 2017<\/strong><\/p>\n

With fewer than four weeks to go to the opening of the 2017 CIBJO Congress in Bangkok, Thailand, on November 5, 2017, the sixth of the CIBJO commissions’ Special Reports has been released. Prepared by Hanco Zwaan, President of the organisation\u2019s Gemmology Commission, the report looks at a series of issues on the agenda of the gemmological community, including guidelines for colour terms like \u201croyal blue\u201d and \u201cpigeon blood red,\u201d and the way in which possible undetermined treatments can be explained on laboratory reports.<\/p>\n

Concerns have been raised about laboratory reports that fail to include comments when gemstone treatments are \u201cundeterminable,\u201d which can be the case with heat treated aquamarines and irradiated tourmalines. \u201cA person reading the report may consider that the lack of information provided implies that the stone is not treated, rather than communicating that there may have\u00a0\u00a0 been a treatment that is undeterminable,\u201d Dr. Zwaan writes.<\/p>\n

To address the issue, in the newest draft of CIBJO\u2019s Gemstone Blue Book it is proposed that laboratories note on reports that an absence or lack of comments in the treatment section of a laboratory report does not necessarily mean that the stone has not been subject to a treatment, for there are treatments that currently cannot be definitively proven to exist. The statement could be followed by a list of undetectable treatments.<\/p>\n

The Special Report also describes progress that was made under CIBJO\u2019s auspices toward harmonising the standards by which laboratories will assign descriptive colour terms like \u201croyal blue\u201d and \u201cpigeon blood red.\u201d There is agreement that only very well saturated colours, within strict limits of hue and tone, are eligible to receive the specific colour terms, but disagreement still remains as to the disagree of fluorescence necessary for the terms to be awarded, and even whether or not fluorescence should be taken into account at all.<\/p>\n

\u201cAdditional steps that need to be taken on this issue will be discussed at the 2017 CIBJO Congress in Bangkok, and hopefully progress will be made,\u201d Dr. Zwaan writes.<\/p>\n

To download a full copy of the CIBJO Gemmology Commission\u2019s special report, PLEASE CLICK HERE.<\/a><\/p>\n<\/div>

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