I am looking at a 2.55 carat round diamond. It has an AGS Excellent 1 cut grade, HCA of 1.6 (shows it in the range for both AGS ideal and GIA excellent candidates). However, Blue Nile lists the cut as only "very good". (Blue Nile has both "ideal" and "signature ideal" above "very good" for cut in their normal ranking system).
Who should I believe? In other words, Blue Nile seems to rate the cut grade significantly lower than AGS or the HCA value would indicate. Why would Blue Nile lower the cut grade of one of their own stones? Do they know something that may not be reflected in the AGS report or the HCA score? I don''t know if I should put more stock into the AGS and HCA values or Blue Nile''s seemingly self depreciated cut grade.
Here are the specifics of the diamond:
2.55 carat
color I
clarity SI1
depth % 60.3
table % 57
crown angle 34.2
pavilion angle 41.0
cutlet none
AGS report shows:
Cut Grade: AGS Excellent 1
light performance 0
proportion factors 0
finish excellent
symmetry ideal
Who should I believe? In other words, Blue Nile seems to rate the cut grade significantly lower than AGS or the HCA value would indicate. Why would Blue Nile lower the cut grade of one of their own stones? Do they know something that may not be reflected in the AGS report or the HCA score? I don''t know if I should put more stock into the AGS and HCA values or Blue Nile''s seemingly self depreciated cut grade.
Here are the specifics of the diamond:
2.55 carat
color I
clarity SI1
depth % 60.3
table % 57
crown angle 34.2
pavilion angle 41.0
cutlet none
AGS report shows:
Cut Grade: AGS Excellent 1
light performance 0
proportion factors 0
finish excellent
symmetry ideal