Why is this stone *only* GIA very good cut?

[FB.]

Can someone explain why this stone didn''t get a GIA Excellent cut grade?

1.01ct
6.32 - 6.37 x 3.97mm
Cut grade: very good
Polish: very good
Symmetry: very good

Table: 57%
Star: 55%
Crown height: 15.0%
Crown angle: 34.5''
Total depth: 62.6%
Lower half: 80%
Pavilion depth: 42.5%
Pavilion angle: 40.7''
Girdle: medium - thick (faceted)

Thanks
FB

 

[stone-cold11]

Thick girdle.

 

[FB.]

Thanks.

That''s what I thought seemed the most out-of range value. But surely this stone is better than many GIA-Ex "steep deep" stones?

Any idea why GIA-Ex allow steep deep (to increase weight), yet don''t allow thick-ish girdles (which also adds invisible weight)?

 

[haagen_dazs]

does the non excellent grading have to do with the fact that these 3 characteristics are not excellent too?

Cut grade: very good
Polish: very good
Symmetry: very good

 

[stone-cold11]

Date: 9/15/2009 5:04:01 PM
Author: haagen_dazs
does the non excellent grading have to do with the fact that these 3 characteristics are not excellent too?

Cut grade: very good

Polish: very good

Symmetry: very good

You mean the other 2 characteristics. No, Ex cut grade can have VG polish and symm.