This stone falls within all recommended guidelines (except for a higher table and slightly thick girdle), including complimentary pavilion guidelines, triple ex rating. It also scores a 1.4 on the HCA with excellent in all categories and very good in spread. Is there anything specific from the numbers or videos that hints that this will not perform relatively well besides optical symmetry?it's not my favorite stone, but it's not terrible either. I think this is destined to end poorly from all the info you've given.
Based on this AGS chart for the 59% table, 35 crown angle and 40.6 pavilion angle, it sits as AGS Ideal.Hint: click on the diamond in the video and you can spin it slowly by moving the mouse.
The basic numbers which are not that reliable from GIA puts it ags1 which is the second step in the AGS grading system.
It means basically above average but not the best cut.
The pictures are useless.
The video shows some irregularities in face up optical symmetry but otherwise supports the base numbers.
Everything is pointing towards an above average but not spectacular diamond.
All that is just my opinion.
Which brings us to the issue of the price which has already been well covered above.
The chart assumes a med. girdle and 78% lower girdle facets.Based on this AGS chart for the 59% table, 35 crown angle and 40.6 pavilion angle, it sits as AGS Ideal.
https://www.diamondscreener.com/wp-content/uploads/reference/agsl_proportion_charts.pdf
Is there another chart or resource I should be looking at?