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Girdle thickness

P: 5/7/2002 11:07:49 PM
gordypc Rough Rock Total Posts: 1 Last Post: Unknown Member Since: 5/7/2002	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?
Posted: 5/7/2002 11:07:49 PM

There are 4 replies to this message. There are 4 replies on this page.

P: 5/8/2002 7:46:37 AM
Pricescope Administrator Total Posts: 8,265 Last Post: 1/5/2008 Member Since: 1/1/2000	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% Pricescope
Posted: 5/8/2002 7:46:37 AM

P: 1/22/2004 12:41:55 AM
cool_rock Rough Rock Total Posts: 30 Last Post: 2/26/2004 Member Since: 1/11/2004	Leonid, Why is there two difference AGS "systems" for girdle thickness??
Posted: 1/22/2004 12:41:55 AM

P: 1/22/2004 9:40:08 AM
Pyramid Ideal Rock Total Posts: 2,914 Last Post: 11/11/2009 Member Since: 11/10/2002	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?
Posted: 1/22/2004 9:40:08 AM

P: 1/22/2004 12:31:35 PM
Rank Amateur Ideal Rock Total Posts: 1,547 Last Post: 5/5/2009 Member Since: 2/26/2003	HRD measures girdle thickness differently. If I remember right Garry prefers the HRD method.
Posted: 1/22/2004 12:31:35 PM

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