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AGSL Committed to Ideal Cut
In 1996, American Gem Society established the AGSL (American Gem Society laboratory) to provide a Diamond Quality Document that included the cut quality evaluation of a round brilliant cut diamond as part of their report. The proportion model AGS used to benchmark their Ideal "0" Cut rating was derived from Mr. Marcel Tolkowsky's model with very minor adjustments.
GIA Not Committed to Ideal Cut
While the GIA, the most prestigious and reliable gemological institution in the industry, is in the midst of rigorous scientific research to determine the precise technical definition of the ideal round brilliant cut, they are not ready at this point in time to commit to a specific model. GIA president, Mr. Bill Boyajian, has repeatedly explained that to base grading on a single standard without concrete scientific data to back it up might unfairly discriminate against stones which though not cut to ideal Tolkowsky proportions may be equally beautiful. The fact remains that while Tolkowsky might have provided proportions for the optimal light performance of the traditional round brilliant cut model this doesn't mean that this 58 facet round brilliant cut is the most optically efficient.
Ideal Cut May Soon Become Standard
With the emerging digital imaging technology that is becoming available to gemologist, the scientific empirical verification tools that GIA needs to establish a reliable cut quality and performance-rating system might be just around the corner. When that time arrives, it is widely believed that Mr. Tolkowsky's model will most definitely be included in GIA's highest cut quality range.
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