GIA REVEALS DIAMOND CUT RESEARCH
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
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)