How do you judge if Girdle is too thin

[pyramid]

On an uncertificated diamond how does one judge if the girdle is too thin?

 

[mkb]

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

 

[Garry H (Cut Nut)]

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.

 

[pyramid]

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?

 

[mkb]

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

 

[pyramid]

Thank you mkb. It was in this thread that John Quixote posted the green chart on new AGS girdle widths https://www.pricescope.com/community/threads/picture-of-a-real-diamond-with-thin-girdle-width.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.

 

[mkb]

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!

 

[DonaBella]

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...