I have a few questions for Dave.
I''ve been well aware of the AGA system for awhile, but I wasn''t really paying attention to some of the cut criteria you have identified that knocks some stones down a few notches. Now that I can punch numbers into your system, a couple cut factors have shot to the top of the list for dropping diamonds out of the 1A class (round brilliant) and now I''m wondering if you can clarify.
I''ve looked at a number of obviously really well cut diamonds with near perfect HCA scores, near perfect BrillianceScope readings, near perfect external and internal symmetry, AGS 0/GIA EX/EX ratings that for all intents and purposes seem to be among the finest diamonds available. I''m talking about diamonds carried by Rhino, Barry, and Robin and Todd. Here are the questions:
1) After running numbers on your system, some of these seemingly perfect/ideal diamonds are getting knocked for pavilion depths of 42.7 or under. Why is that? Do you have a reason for 42.8 being the 1A cutoff? The stats of a number of otherwise 1A diamonds I''ve seen that are below 42.8 pavilion depth seem to indicate there''s not a good reason for suggesting these to be 1B diamonds.
2) On some of the same diamonds, they are falling to 1B or 2A based on girdle readings of "thin to medium"? I''m wondering why this should make a diamond fall out of 1A.
3) I''m seeing ostensibly perfectly cut diamonds with near perfect stats dropping from 1A to 1B or 2A based just on slight variations in pavilion depth and girdle width. However, there does not seem to be a logical reason for this. It makes these AGA class categories seem somewhat arbitrary unless you have a better explanation.
I''ve been well aware of the AGA system for awhile, but I wasn''t really paying attention to some of the cut criteria you have identified that knocks some stones down a few notches. Now that I can punch numbers into your system, a couple cut factors have shot to the top of the list for dropping diamonds out of the 1A class (round brilliant) and now I''m wondering if you can clarify.
I''ve looked at a number of obviously really well cut diamonds with near perfect HCA scores, near perfect BrillianceScope readings, near perfect external and internal symmetry, AGS 0/GIA EX/EX ratings that for all intents and purposes seem to be among the finest diamonds available. I''m talking about diamonds carried by Rhino, Barry, and Robin and Todd. Here are the questions:
1) After running numbers on your system, some of these seemingly perfect/ideal diamonds are getting knocked for pavilion depths of 42.7 or under. Why is that? Do you have a reason for 42.8 being the 1A cutoff? The stats of a number of otherwise 1A diamonds I''ve seen that are below 42.8 pavilion depth seem to indicate there''s not a good reason for suggesting these to be 1B diamonds.
2) On some of the same diamonds, they are falling to 1B or 2A based on girdle readings of "thin to medium"? I''m wondering why this should make a diamond fall out of 1A.
3) I''m seeing ostensibly perfectly cut diamonds with near perfect stats dropping from 1A to 1B or 2A based just on slight variations in pavilion depth and girdle width. However, there does not seem to be a logical reason for this. It makes these AGA class categories seem somewhat arbitrary unless you have a better explanation.