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Girdle thickness

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gordypc

Rough_Rock
Joined
May 7, 2002
Messages
1
I am close to pulling the trigger on a diamond. I have narrowed my search down to several ideal cut diamonds. However, I'm still not clear on the girdle thickness of some of them. Several of them have girdle sizes described in terms of thin to slightly thick, which I understand is good. However, some of the diamonds have the girdle described in numeric terms. One is 1.2 - 1.9. Another is .7 - 1.0. The third is 1.2 - 1.5. When the girdle is stated in numeric terms, what should I be looking for on an otherwise ideal diamond?
 

pricescope

Ideal_Rock
Joined
Dec 31, 1999
Messages
8,266
Hi Gordypc,

Different labs use different systems for girdle thickness: GIA measures mm while AGS %.

If your numbers are from AGS report, then they are:

0.7% - 1.0% - Thin
1.2% - 1.9% - Medium-Sl.Thick
1.2% - 1.5% - Medium



GIA
Extremely thin 0.00 - 0.08 mm
Very thin 0.08 - 0.12 mm
Thin 0.12 - 0.15 mm
Medium 0.15 - 0.20 mm
Slightly thick 0.20 - 0.23 mm
Thick 0.23 - 0.33 mm
Very thick 0.33 - 0.40 mm
Extremely Thick: greater than 0.40 millimeters

AGS
Very thin 0.091 - 0.50%
Thin 0.51 - 1.2%
Medium 1.21 - 1.7%
Slightly thick 1.71 - 2.95%
Thick 2.96 - 4.2%
Very thick 4.21 - 5.7%
Extremely Thick: >= 5.71 %

HRD
Ex.Thin 0.0 - 0.5%
Very Thin 0.5 - 1.5%
Thin 1.5 - 2.5%
Medium 2.5 - 4.5%
Sl.Thick 4.5 - 6.0%
Thick 6.0 - 7.5%
Very Thick 7.5 - 8.0%
Ex. Thick 8.0 - 100%
 

pyramid

Ideal_Rock
Premium
Joined
Nov 10, 2002
Messages
4,607
Why is the HRD percentage for say a medium girdle so much more than the AGS percentage for medium girdle?

I know they are different labs but does anyone know their reasoning for this? Are diamonds in Europe cut with thicker girdles to prevent damage?
 

Rank Amateur

Brilliant_Rock
Joined
Feb 26, 2003
Messages
1,553
HRD measures girdle thickness differently.

If I remember right Garry prefers the HRD method.
 
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