Idealscope image vs HCA results

[julesxxxooo]

Hi,
This is our first diamond purchase and I'm a bit nervous. We've got a diamond on hold, waiting for a gemologist review. I was wondering about the HCA tool's results vs idealscope images. This diamond is a true hearts, from my untrained eye, the idealscope images look decent. But the HCA score is a 2.7 - Very Good.
I'm not sure how reliable the HCA scores are, I did read that it states to use this tool to exclude diamonds and going by that reasoning, I may have passed on this one if I had checked it's grade first. Should I be concerned? Are the idealscope images ok?

The ring is graded 3X by GIA. It's got a large feather that I am having checked out but it looks so clean for an SI2.
Depth 62.2%
Table 57%
crown angle 35.5
pav angle 40.8
no culet

HCA results are Very Good for all factors with total score of 2.7.

GIA 1166355173
http://www.jamesallen.com/loose-diamonds/round-cut/1.01-carat-f-color-si2-clarity-excellent-cut-sku-356889

 

[John P]

Are the idealscope images ok?

Without the full story the HCA rejects combinations like this. However your ideal-scope and pavilion image trump the HCA.

The 57/40.8/35.5 combination can be problematic in commercially cut goods, especially as GIA rounding may be hiding a deeper combination like 57/40.9/35.7. This specimen shows better cut-consistency than commercial goods, and the angles are possibly at-or-shallower than the averages shown, thus negligible light-loss.

In the same spirit, the AGSL cut-guides predict this combination (without more info) to receive AGS 2-4 in light performance. However, a diamond with consistent cutting, smart minor facet choices and proper indexing might move up to receive AGS 0-1, which seems in-keeping with this image.

BTW, this is why having an ideal-scope or ASET photo is important for proper analysis.

 

[julesxxxooo]

thank you!