Is this really an AGS 0 diamond?

[Mattcv]

The AGS report indicates that this diamond is an AGS0 grade stone; however, the HCA shows it to be outside the white box which I believe indicates an AGS0 grade.

Why is there a difference and should I be concerned by the difference?

 

[Mattcv]

AGS Report

 

[stone-cold11]

Yes, it is.

The HCA AGS outline is just a 2D outline for cutter. AGS Performance Based Grading is based on 3D. So even if the average numbers falls inside the cutter guideline, it may not achieve AGS0.

 

[Mattcv]

So if it shows it falling just outside the AGS0 on the HCA I should worry about it?

 

[Lorelei]

Date: 8/7/2009 11:28:48 AM
Author: Mattcv
So if it shows it falling just outside the AGS0 on the HCA I should worry about it?

No, if it has the AGS0 grade thats what matters.

 

[stone-cold11]

Yap, no worries, as long as the IS looks good.

 

[Todd Gray]

Here is a screenshot of the AGS proportions guidelines for round brilliant cut diamonds with a 58% table (57.9% table rounds up to 58%) and as you can see, the diamond does fall into the pink Ideal sector with a crown angle of 34.9 degrees offset by a pavilion angle of 40.9 degrees. You''re good

 

[Mattcv]

Thanks for the great responses!!!