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The GIA report is the best and most widely used rating for diamond performance. Each report contains the dimensions of the diamond as well as a rating of performance.
The GemEx Light Performance Report measures and certifies the optical brilliance, fire and sparkle of a diamond using a patented optical spectrophotometer.
A Light Path Scope is used to analyze the total light return for the diamond. This provides a valuable indicator for the overall brilliance of the diamond.
An optical scope is used to analyze the "hearts and arrows" symmetry of the diamond. This provides an indicator of the quality of the light distribution emitted by the diamond.