I kinda think 44% depth on the pavilion is a little to deep for the diamond listed.. probly paying for size you cant see… ie in its depth, rather than it’s width…and it would be suffering in performance...ie low light return.
I’d look for a rock with a pavilion depth closer to 41-42%
Garry''s "Cut Adviser" doesn''t quite favor these proportions... ''guess you have tried that out already.
With percentages available instead of angles this kind of guessing for potential brilliance is not as precise as it might. Even if total depth and girdle thickness would be there
It would be great to see photos or - even better - IdealScope. Without knowing what this piece looks like,it just remains to judge how much of a bargain it is next to a matching piece for which detailed info is avialble. Well, IMO at least.