Repeatability:+/- 0.005mm with 2 Sigma probability for linear measurements for all sizes except for table. Repeatability for angles depends on size of stone
Color: +/- 1/3rd of a color grade with 2 Sigma probability
Fluorescence: +/- 1/3rd of a fluorescence grade with 2 Sigma probability
Light Behavior: Brilliance +/- 2%, Sparkle +/- 2% and Intensity +/- 4 % with 98% probability
Repeatability of Clarity Grades: +/- ½ of a Clarity grade with 2 Sigma probability