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Article: Solitaire Pro
May/June 2005 Issue
GIA reveals diamond cut research


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The Gemological Institute of America (GIA) has revealed the progression and foundations of its ongoing diamond cut research at a presentation in Tuscon on

6 February. It has concluded after 16 years of research that there are many ways to cut a round brilliant diamond to give it a pleasing overall appearance. GIA Research Associate Al Gilbertson and Manager of Laboratory Communications for the GIA Gem Laboratory, Barak Green, presented their their observations where computer-modelled predictions of brightness and fire were compared with observations from individuals. The predictions have helped them develop a comprehensive system comprising of all components that is now the framework of GIA’s diamond cut grading system.


According to Gilbertson and Green, seven components must be considered together when assessing the overall cut quality of a diamond – brightness, fire, scintillation, weight ration, durability, polish and symmetry. There will be five overall cut grades, which will initially be applied to all standard round brilliant diamonds in the GIA D-to-Z colour grading scale, from flawless to I3. GIA plans to add this new cut grade to their GIA Diamond Grading Report and Diamond Dossier later this year.

Source : Solitaire Pro (May/June 2005 Issue)


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