Quick Advice needed - Which Diamond??

[Boston2001]

Hello, I need to make a quick decision between the following 2 stones. Any input is greatly appreciated!!
Diamond 1
1.39 c Round Solitaire
7.15 - 7.23 x 4.42
F Color
VVS2
EX/EX Polish Symmetry
Table: 57%
Depth: 61.5%
Crown Angle: 35.4
Crown Height: 14.9%
Pav Angle: 40.9
Pav Depth: 43.4%
HCA: 3.0

Diamond 2
1.36 c Round Solitaire
7.15 - 7.20 x 4.42
F Color
VVS2
EX/EX Polish Symmetry
Table: 54%
Depth: 61.6%
Crown Angle: 34.7
Crown Height: 15.6%
Pav Angle: 40.9
Pav Depth: 43.3%
HCA: 1.7

Any advice would be greatly appreciated!

 

[Garry H (Cut Nut)]

You already have my hCA opinion

 

[Boston2001]

Yes, but are there any circumstances under which a diamond with a lower HCA (in this case diamond #2) may exhibit less brilliance than a diamond with a higher HCA?
Or is there no way to know for sure unless you run it through an ideal scope?

 

[Garry H (Cut Nut)]

Unless it was broken or had very bad symmetry - I would consider further tests on the lower HCA stone and would not waste the vendors time with the HCA3 stone.

 

[Boston2001]

They both have excellent symmetry so it''s not that.
What do you mean by "broken"?
Thanks,
Ash

 

[Garry H (Cut Nut)]

Smashed, chipped damaged.

What labs grade is not the symmetry I am concerned with in regard to hCA.
GIA Good can be excellent for optical symmetry, and GIA Excellent can be just good (good = average = bad).

http://www.gemology.ru/cut/english/symmetry/ read this

 

[Boston2001]

Thanks for the link - very informative and helpful.
I will get to look at both diamonds next week side by side and can then make a final decision. Unfortunately, one of them is mounted on a ring already (the one I thought I was going to buy).
Since I can''t use an ideal scope on it, I was just going to visually compare the diamond on the mounted ring against the loose stone. Does anyone know if that would be an "apples to apples" comparison? Or does the ring somehow affect the brilliance of the mounted stone?