The Lab Director of the American Gem Society diamond grading laboratory, Peter Yantzer, ran a Helium 3 Dimensional file through the AGS ASET grading software and concluded that the deep stone (C) rates as AGS 2 and (A) rates AGS 3 on a scale where 0 is best and 10 is worst.
Stone (A) received a cut grade of AGS 3 with deductions of:
- 1.2 for contrast
- Nil for leakage
- Nil for face up brightness
- 0.5 for face up dispersion
- 1 for tilt (the girdle can be seen with about 58 of tilt)
- Total 2.7 = cut grade of 3
Stone (B) received 0 for light performance. It has an extra facet or natural on the pavilion that would lower the symmetry grade – probably to AGS 1.
Stone (C) received these deductions using the AGS software:
- 0.8 for contrast
- 0.5 for face up leakage
- 0.5 for face up brightness
- 0.3 for face up dispersion
- Total 2.1 = cut grade of 2