Need comparison help please

[Tarams]

Diamond #1 is a 1.32ct D VS2 (GIA cert)
7.03-7.10x4.35
cut = excellent
depth 61.6
table 59
Crown Angle 35.0
crown height 14.5
pav angle 41.4
pav depth 44

star length 55%
lower half 80%

girdle thin - med, faceted
no culet; no fluoresence
********************************
Diamond #2 is a 1.25ct D Si1 (GIA Cert)
6.91-6.98x4.27
cut=excellent
Table = 56
Crown Angle 34.5
Crown Height 15.5
Pav Depth 43
total depth 61.5

girdle thin-medium, faceted
no culet, no fluoresence

polish/symmetry/cut - all excellent

I haven''t seen either stone, they''re both just under 10k. Can I get your opinions & thoughts? Thanks!

 

[stone-cold11]

What is the pavilion angle for the second stone?

 

[neatfreak]

The first one is pretty poorly cut, I would pass. And the second one, can you check the numbers? Something seems to be off there too or you are missing the PA.

 

[stone-cold11]

Stone 1 is definitely out. HCA = 5.2 in the steep/deep region, will result in light leakage.

Stone 2 looks good but need pavilion angle to nail that down. Are they eye-clean?

 

[Tarams]

Pavilion angle on stone #2 is 40.6


I did the HCA advisor (?) online & see stone #2 seems to be better. But it seems to fall out of the range of AGS?

 

[stone-cold11]

It looks good, just slightly more shallow than ideal AGS. This means that it could result in the darkening of the stone if you are looking at it too closely, and this is a borderline case so may not happen, like within a foot from the stone. Check to see it yourself or if possible post the IS of the stone here and we can make a better recommendation on it.

 

[Tarams]

I made a mistake - stone # 2 may have a total depth of 60.7

 

[Tarams]

Lets re do stone # 2, here''s the info:

Shape: Round

Table % 56.0% Grade: 1A

Crown Angle 35.5° Grade: 2A

Crown Height % 15.5% Grade: 1A

Pavilion Depth % 43.0% Grade: 1A

Girdle Thickness Thin -Medium FACETED Grade: 1A

Total Depth % 61.5% Grade: 1A

Polish Excellent / Very Good Grade: 1A * Not a primary determining factor.

Symmetry Excellent / Very Good Grade: 1A * Not a primary determining factor.

Final Grade: 1B AMERICAN IDEAL CUT TRIPLE EXCELLENT HEARTS AND ARROWS

 

[stone-cold11]

with the new info, looks like stone 2 is the sure winner assuming it is eye-clean...

60.7% depth, 56% table, 35.5° crown angle, 40.6° pavilion angle HCA 1.1

 

[neatfreak]

Date: 12/10/2008 6:58:16 PM
Author: Stone-cold11
with the new info, looks like stone 2 is the sure winner assuming it is eye-clean...


60.7% depth, 56% table, 35.5° crown angle, 40.6° pavilion angle HCA 1.1

Ditto. No question on that one.

 

[Tarams]

I''m sorry, these are the correct specs for diamond #2:

depth is 61.5
table 56
crown angle 35.5
crown height 15.5
pav angle 40.8
pav depth 43.0

star length 50%
lower half 80%

This is what should be compared to the above stone #1!
(sorry again!)

 

[Tarams]

When I put info in to HCS diamond #2 comes back "very good" in all 4 catagories but is still out of AGS range. What is AGS range for? It''s suppose to be a hearts & arrows cut...I must be confused!

 

[stone-cold11]

Make up your mind!! Just kidding.. :p

61.5% depth, 56% table, 35.5° crown angle, 40.8° pavilion angle. HCA 2.5.

Still much better than the stone 1. Need IS to confirm that it is not leaking light though. Will you be seeing it in person or can the vendor supply you with an IS pic of the stone?

 

[stone-cold11]

Date: 12/10/2008 7:24:44 PM
Author: Tarams
When I put info in to HCS diamond #2 comes back ''very good'' in all 4 catagories but is still out of AGS range. What is AGS range for? It''s suppose to be a hearts & arrows cut...I must be confused!

AGS range is what a round should be cut to get a AGS0 cut grade. That said, the stone might not actually get it because of other facets'' angles, symm. The AGS range on the HCA has nothing to do with H&A. A H&A is happens because of ideal optical symm that creates the hearts and arrows shapes. A non-ideal cut stone may be a H&A and an ideal cut stone may not be an H&A.

 

[Tarams]

Thank you. Ok, what is "IS"?

 

[stone-cold11]

OOps, IdealScope (IS). http://diamonds.pricescope.com/firescope.asp

 

[Tarams]

Ah, Ideal Scope!

 

[Lorelei]

Date: 12/10/2008 7:31:45 PM
Author: Tarams
Thank you. Ok, what is 'IS'?

Hi Tara!

I would ask for an Idealscope for the second diamond.

And also with 40.6 pav angles I am doubtful that there would be any darkening of the diamond, especially with harmonising crown angles.