AGA/NAJA Cut Class Diamond Grading Screening Tool

Created by David Atlas and assisted by James Jolliff and Joseph Tenhagen along with several other diamond traders in the years since it was first produced in the early 1990's. This tool will assist you to estimate the cut quality of nearly every shape of diamond.

If you have any problems with this application please contact Dave Atlas, datlas@datlas.com. Please let us know what you entered.

Stone Shape
Dimensions

(Length mm)

(Width mm)

(Depth mm)

Table %

Crown Height %

Girdle Thickness (thinnest to thickest)

From

For round stones only - Crown angle & Pavilion depth %

Crown Angle °

Pavilion Depth %

Polish

Symmetry

Polish and Symmetry are important, but do not alter the AGA Cut Class Grade calculation.