I recently had a conversation with an online helper from the Shane Company that you all might find interesting.
me: could you tell me more about your in house grading system?
Dustin: I know that neither of those diamonds will have a grading lab cert. Our cert''d diamonds will be over half a carat in weight.
Dustin: Our in house grading system is proprietary to the Shane Company/
Dustin: It''s a rated system, similar to how AGS grades there cut. AGS uses a scale of 1 -10
Dustin: *their cut
Dustin: Because there is no standard to do so, companies will use their own method to grade.
Dustin: What one company will call an "Ideal" most likely is not what another company considers "ideal"
ME: how do you assign those numbers. do you have a range of percentages that equal a 1, etc.
Dustin: Cut grades are based on a number of dimensions. Table size, crown angle, girdle thickness, pavilion depth, culet size, symmetry, etc.
ME: so what are the maximum and minimum table sizes, crown angles, girdle thickness, pavilion depth, culet size symmetry, etc for a #2 class from you guys
Dustin: I do not have that information. That is all done by our diamond graders.
ME: is there any way that I could get that information.
Dustin: No, I''m sorry I would not have that information for you.
ME: You couldn''t get it from your home office, or from the graders.
ME: I could wait for an email.
Dustin: No, it''s a proprietary system. I can not give out that information.
ME: Thank you, good bye.
Dustin: Was there any other questions I could answer for you?
Does this seem normal for you guys? Do most companies keep their grading system confedential?