Help me with her girdle

[Thegroom]

I''m looking at a particular stone but am having trouble finding much about girdles and what I should look for or what is considered okay. The GIA rates the stone''s girdle as medium to thick/faceted, and AGS measurements show it as 1.9-2.9%. First, is this range between the maximum and minimum in the girdle significant? Second, since the girdle is on the thicker side, does this effect the diamonds appearance or value? Other than that, the diamond rates a 1.1 on the Halloway Cut Advisor with the following info:

1.52 carot
depth - 61.6%
table - 57%
crown angle - 34
pavilion angle - 40.8
culet - 0.9%

Any information would be appreciated as this is my first diamond purchase. Thanks!

 

[Colored Gemstone Nut]

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On 9/1/2003 12

1:51 AM Thegroom wrote:


I'm looking at a particular stone but am having trouble finding much about girdles and what I should look for or what is considered okay. The GIA rates the stone's girdle as medium to thick/faceted, and AGS measurements show it as 1.9-2.9%. First, is this range between the maximum and minimum in the girdle significant? Second, since the girdle is on the thicker side, does this effect the diamonds appearance or value? Other than that, the diamond rates a 1.1 on the Halloway Cut Advisor with the following info:

 

[niceice]

Actually, the girdle measurement reference here is "slightly thick to thick" and usually IS the result of the cutter trying to retain weight during the cutting process. That said, the critical pavilion angle is at 40.8 degrees which is right within the range where you want it to be (40.6 - 40.9 degrees) and thus the diamond is probably quite pretty, but you're going to have a pretty noticeable girdle which is likely to look pretty thick from a side profile.

 

[Colored Gemstone Nut]

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On 9/1/2003 8:30:59 PM niceice wrote:

Actually, the girdle measurement reference here is "slightly thick to thick" and usually IS the result of the cutter trying to retain weight during the cutting process. That said, the critical pavilion angle is at 40.8 degrees which is right within the range where you want it to be (40.6 - 40.9 degrees) and thus the diamond is probably quite pretty, but you're going to have a pretty noticeable girdle which is likely to look pretty thick from a side profile.
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Excuse my ignorance Robin & Todd..I am still in the learning stages...

What would be an acceptable girdle thickness within the ideal AGS cut range which would generate a beautiful stone without trying to maintain some of the weight in the girdle when cutting. I see the "0" Ags proportion grade allows the girdle thickness to reach 3%, but what is an acceptable variance between the measurements around the girdle in your experience..or any other vendor which might add their experience.

-Josh

 

[Mikesgirl]

Hi. Go to www.gemappraisers.com and check out David Atlas's charts. His AGA grading system is more selective than AGS, and his 1A and 1B grade shows a girdle of 1.7 to 3, I believe. This is considered medium and optimal, by his very highly respected standards. Supposedly only 2 to 5% of all cut stones meet his exacting standards for 1A and 1B cuts. I've been looking at a stone with a .9 to 1.7 girdle and the description by the vendor is thin to medium. I have been told by others on this site that it is accurate.

 

[Colored Gemstone Nut]

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On 9/1/2003 11:57:47 PM Mikesgirl wrote:

Hi. Go to www.gemappraisers.com and check out David Atlas's charts. His AGA grading system is more selective than AGS, and his 1A and 1B grade shows a girdle of 1.7 to 3, I believe. This is considered medium and optimal, by his very highly respected standards. Supposedly only 2 to 5% of all cut stones meet his exacting standards for 1A and 1B cuts. I've been looking at a stone with a .9 to 1.7 girdle and the description by the vendor is thin to medium. I have been told by others on this site that it is accurate.
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Hi:

I am aware of the site and the cut charts. My original resonse to Thegroom was that I did not think the variation between 1.9-2.9 warranted any concern, but as robin and todd state their opinions I want to know specifics on what is considered a good variance between the measurements of the girdle within the AGS "0" defined grade. Robin and Todd state that they think the stone was cut to retain a little more weight and I wanted specifics on what a good tolerance in thickness was including the variances between the measurements..

-Josh