Please Note: The estimated cut grades represented in these tables apply ONLY valid for standard round brilliant diamonds in the D-to-Z color range, and with the following default values for certain proportions and finish:

Star Length = 55%
Lower-Half Length = 80%
Polish and/or Symmetry = VG or EX
Girdle Thickness = 3.0%
Girdle Min/Max = THN-STK
Culet Size = NON-SML

To view estimated cut grades for diamonds with different values for the above default parameters, please use the GIA Facetware® Cut Estimator.

© 2006 GIA