Fig 3. shows
Ideal-scope (top) and
AGS ASET images for the same three diamonds from Table 1: shallow, ideal and deep.
Figure 3. Ideal-scope (top) and AGS ASET (bottom) images of the diamonds from Table 1
The shallow VG stone (A) shows too many dark zones in the ideal-scope and too much blue through ASET. The 'ideal' stone (B) has excellent Ideal-scope and ASET images, deserving of its Excellent cut grade. The deep GIA Excellent stone (C) has a lot of leakage just inside the table, and the dark or blue star pattern is weak in Ideal-scope and ASET images respectively. This stone has a very good DiamCalc contrast score (1.01), but because the stone is large enough for the leakage zone (contributing to the stones contrast score) to be visually seen as a circular dark zone, I believe the contrast result is misleading.