GIA Cut Table vs HCA Score

[xyzinfo]

I am comparing HCA Score to GIA Estimated Cut Table located on this website
http://diamondcut.gia.edu/pdf/booklet_cut_estimation_tables_lowres.pdf


based on this diamond parameter of 61.7% depth, 58% table, 33.5° crown angle, 41.6° pavilion angle, according to the GIA cut table, I am located in the center of the Excellent Cut (not borderline), Why is the HCA score so High (5.0)


Factor Grade
Light Return Good
Fire Good
Scintillation Good
Spread
or diameter for weight Very Good
HCA Score 5.0


Thanks

 

[xyzinfo]

additional spec from GIA report

 

[c-k]

I hope you get an expert to reply...but my guess is that GIA has a 'very broad' range for EX cut