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GIA will describe diamond fluorescence grading in its reports
The information will explain phenomena of ultraviolet fluorescence in diamonds
By: Diamond World News Service
Jul 8 2009 3:36PM
Reference: 3979  


The Gemological Institute of America (GIA) has created literature which will help elucidate the phenomenon of ultraviolet fluorescence in diamonds, more effectively in its grading reports. The information will describe fluorescence and its properties, and will appear in every GIA Diamond Grading Report and Diamond Dossier® that carries a diamond fluorescence description of medium or stronger.

There is a four-colour insert which addresses the most frequently asked questions about fluorescence, explains its properties and includes comparison images of diamonds in both natural and UV light to illustrate varying intensities of fluorescence. Until recently, for over 50 years, GIA has indicated the presence of diamond fluorescence on its diamond grading reports, but as an identification characteristic only – not a grade, explained Thomas M. Moses, GIA’s senior vice president of Laboratory and Research. The five terms GIA uses to classify the intensity of the fluorescence are: None, Faint, Medium, Strong, and Very Strong.

“Some diamonds show fluorescence and some don’t,” said Moses. He further added “Fluorescence is the emission of visible light by a diamond when it is stimulated by invisible ultraviolet (UV) rays. It is a common characteristic of diamonds. The diamond simply glows under the UV lights, usually a blue colour, which most often stops when the energy source causing it is removed.”

“This insert will help the public better understand diamonds in general, which gives them more confidence and knowledge when making a decision about a diamond,” he said.

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Daniel F Katz GG Diamond Imports Pty Ltd
(SYDNEY !!!)
....when determining a diamond's transparency grading. * oops looks like I ran out of ink. Be well
Daniel F Katz GG Diamond Imports Pty Ltd
(SYDNEY !!!)
The misconceptions that fluorescence should be frowned upon has caused doubt in the mind of the diamond consumer largely because of ignorance, ill equipped and inexperienced diamond vendors who are not trained diamond graders. * Many a beautiful diamond has been overlooked and ignored just because of a simple few terms quoted on a diamond's grading report more out of fear than any other reason. * Terms on diamond certificates should not always determine or influence the reason for purchase. * TRANSPARENCY GRADES NOT FLUORESCENCE GRADES ARE REQUIRED. * In Australia the Diamond Certification Laboratory an International Diamond Council lab, is already doing this. * The Diamond Certification Laboratory of Australia was the first diamond grading laboratory in the world to introduce a scientifically calculated transperancy grade not to be confused with a fluorescence grade although they may be connected in conjunction with a diamond's clarity grade all combined when determining a d
Daniel F Katz GG
Fluorescence simply is a measurement of a diamond's ability to glow or shimmer under different forms of light to varying degrees of intensity. How fluorescence affects the beauty of a diamond is up to the judgment of the buyer with the aid of proper and correct disclosure irrespective of any defined gemmological terms of description that may appear on a diamond certificate influencing your decision to purchase. The transparency of a diamond and NOT it's fluorescence should be considered as a major diamond pricing factor ~ Defining the importance of diamonds' fluorescence ability to influence diamond transparency as a pricing factor has never been considered as a grading qualification on diamond grading reports in the past. ~ Rather than a fluorescence grade a transparency grade would be nore relevant and certainly more usdeful.
ashvinkumar m lashkare.
how could you decide the difference in fluorescence None, Faint, Medium, Strong, and Very Strong. I am very happy to read this news ...
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