GIA With IDEAL Proportions
EXCELLENT POLISH EXCELLENT SYMMETRY
OR
VERY GOOD POLISH VERY GOOD SYMMETRY
A diamond having the above ratings on a GIA certificate would be comparable to an AGS Triple Zero. Providing that the diamond has ideal proportions meaning the table is between 54-57%, the depth is in the range of approx. 59.5 to 62.5%, and the girdle is in the range of thin to slightly thick, and the ‘polish and symmetry’ are rated as ‘excellent’ or ‘very good’, then the diamond would be equivalent to an AGS Triple Zero. These diamonds have the same spectacular overwhelming brilliance that the AGS000’s have. Even though the range of tables is from 54 to 57% the optimal ones are 55 and 56%. Even though the ideal depth range is approx. 59.5 to 63% the optimal depth is from approx. 60 to 61.7%.
So, if you have an AGS000 (Triple Zero), that would be equivalent to a GIA EX, EX (or VG VG, or VG EX or EX VG). The GIA certed diamond would of course have to have ‘ideal’ proportions. Then, you have that assurance of total spectacular brilliance!!!
