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Help - GIA, Vendor, and Cutadvisor Rate Cut Differently

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cruzan

Rough_Rock
Joined
Mar 17, 2009
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4
Thanks first for your help.

I found what I think is a good deal on a nice diamond from a reputable, large internet vendor. It''s table=57%, depth=61.7 crown angle=33.5, pavillion angle=41, no culet, 6.56x6.61x4.06mm. The vendor has it listed as Ideal Cut, I checked the GIA report and it says VG with symmetry and polish VG. Hmmm. Size is 1.08, VS2, color I, with strong Floresence (which I think may be a plus).

I checked it on Cutadvisor and it scored 1.2 with Excellent in all but spread which is Very Good. I went on GIA''s site and tried their facetware estimator and found that the girdle size of thin to thick (faceted) is the difference between very good and excellent - looks like thick isn''t good.

Please let me know your opinions on how this stone will look and what I should do. I can''t understand what the cut really is and how much difference it makes.

Thanks
 

atroop711

Ideal_Rock
Joined
Aug 31, 2005
Messages
2,844
I''m sure one of the PSers with experience will chime in but I can tell you that strong blue Fluor. is great. I have it and makes my H colored stone really white to the eye! Gl and I hope someone will give you some advice soon
 

Paul-Antwerp

Ideal_Rock
Trade
Joined
Sep 2, 2002
Messages
2,852
First, I would forget about the vendor-rating. It is highly personal, and it is unfortunately unclear what it is based upon. For sure, it is not based upon the GIA-report.

The GIA-report is the most authentic piece of information. The VG-cut-grade for the girdle is kind of confirmed by the HCA, although the HCA is extremely strict in its spread-rating.

Next step would be to get pictures, preferably of ideal-scope and ASET, possibly of H&A.

Live long,
 

Lorelei

Super_Ideal_Rock
Premium
Joined
Apr 30, 2005
Messages
42,064
Date: 3/17/2009 7:35:10 AM
Author: Paul-Antwerp
First, I would forget about the vendor-rating. It is highly personal, and it is unfortunately unclear what it is based upon. For sure, it is not based upon the GIA-report.

The GIA-report is the most authentic piece of information. The VG-cut-grade for the girdle is kind of confirmed by the HCA, although the HCA is extremely strict in its spread-rating.

Next step would be to get pictures, preferably of ideal-scope and ASET, possibly of H&A.

Live long,
Ditto Paul, if you could get ASET and or IS images that would be a big help.
 

cruzan

Rough_Rock
Joined
Mar 17, 2009
Messages
4
Thanks for your suggestions, I''ll ask for the reports.

If the stone costs less because the girdle is thick instead of medium, then it may be a good way to get a better price on an excellent cut?
 

Lorelei

Super_Ideal_Rock
Premium
Joined
Apr 30, 2005
Messages
42,064
Date: 3/17/2009 10:09:11 PM
Author: cruzan
Thanks for your suggestions, I''ll ask for the reports.

If the stone costs less because the girdle is thick instead of medium, then it may be a good way to get a better price on an excellent cut?
It depends on all the other proportions of the diamond and how much of the girdle average actually is thick.
 
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