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»  » Diamond Prices and Grading »
 » RockyTalky
»  » How do you judge if Girdle is too thin
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How do you judge if Girdle is too thin |
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| P: 7/28/2005 5:22:38 AM | |
Pyramid Ideal Rock Total Posts: 2,914 Last Post: 11/11/2009 Member Since: 11/10/2002 |
On an uncertificated diamond how does one judge if the girdle is too thin?
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| Posted: 7/28/2005 5:22:38 AM | |
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There are 7 replies to this message. There are 7 replies on this page. |
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| P: 7/28/2005 5:57:23 AM | |
mkb Rough Rock Total Posts: 47 Last Post: 12/5/2005 Member Since: 7/1/2005 |
Hi, in the old days a very thin girdle would have been described as a 'knife edge' girdle, a thin girdle as 'sharp'. These descriptions are not very scientific but can help. Gary had posted some nice drawings on girdle thickness and the effect on AGS grading. I'll try to find them, I am sure when he reads this he will be happy to help. br luc If you don't know aKs somebody! |
| Posted: 7/28/2005 5:57:23 AM | |
| P: 7/28/2005 7:42:53 AM | |
Garry H (Cut Nut) Ideal Rock Total Posts: 11,577 Last Post: 11/22/2009 Member Since: 8/16/2000 |
Irrespective of a diamonds size (above say .10ct to 1.00ct) you should be able to see the girdle with your naked eye assuming you have very good eyesight and good lighting.
Garry Holloway FGAA DipDT |
| Posted: 7/28/2005 7:42:53 AM | |
| P: 7/28/2005 6:51:17 PM | |
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Pyramid Ideal Rock Total Posts: 2,914 Last Post: 11/11/2009 Member Since: 11/10/2002 |
Thank you Garry H and mkb. mkb in the old days did they have a grade for extremely thin also or just very thin and thin?
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| Posted: 7/28/2005 6:51:17 PM | |
| P: 7/28/2005 10:30:10 PM | |
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mkb Rough Rock Total Posts: 47 Last Post: 12/5/2005 Member Since: 7/1/2005 |
Sorry, couldn't get on the net yesterday night. A girdle any thinner then 'knife edge' would not be round anymore. The upper girdle facets (top halves) would have cut through the girdle into the lower girdle facets (bottom halves). So I would think that was the most severe grade. br luc If you don't know aKs somebody! |
| Posted: 7/28/2005 10:30:10 PM | |
| P: 7/29/2005 5:54:57 PM | |
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Pyramid Ideal Rock Total Posts: 2,914 Last Post: 11/11/2009 Member Since: 11/10/2002 |
Thank you mkb. It was in this thread that John Quixote posted the green chart on new AGS girdle widths http://www.pricescope.com/idealbb/view.asp?topicID=30982 It is interesting to note that they are now calling 'Extremely Thin' a KNIFE EDGE girdle (in their description column), rather than the old 'Very Thin' being knife edge. They do not mention sharp so maybe the name tags do not correlate with the old gradings.
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| Posted: 7/29/2005 5:54:57 PM | |
| P: 7/29/2005 10:27:39 PM | |
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mkb Rough Rock Total Posts: 47 Last Post: 12/5/2005 Member Since: 7/1/2005 |
Thanks a lot for the thread, I thought it was gary that posted it. I lost that thread and was looking for it to use in my class. thank you piramid and john!  If you don't know aKs somebody! |
| Posted: 7/29/2005 10:27:39 PM | |
| P: 7/30/2005 3:04:23 AM | |
DeannaBana Ideal Rock Total Posts: 1,081 Last Post: 5/8/2007 Member Since: 6/11/2005 |
Hi Garry! I wondered...am I better off getting a more shallow stone that is not too deep with a larger table (this is of course provided I decide to go with a briliant cushion cut stone of around a 2.05+ carat size or bigger or a Regent cut--which would "rock" my world)? Also, how much "sparkle" and "brilliance" am I sacrificing for a fancy cut--which I presume that anything other than a round is? I appreciate your patience and knowledge on this... Deanne Campbell |
| Posted: 7/30/2005 3:04:23 AM | |
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