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HCA results are for Medium Girdle?

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gr8foolishness

Rough_Rock
Joined
Dec 19, 2001
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7
How much do the HCA results vary based on a thin or thick girdle? And what range of measurements constitutes thin/medium/thick based on the measurements given on a Sarin report or AGS certificate-these measurements are from valley to valley-correct? :read:
 

Garry H (Cut Nut)

Super_Ideal_Rock
Trade
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Aug 15, 2000
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15,306
Girdle has a very minor effect on beauty and a major effect on spread. The latter is taken into account a little - we will have a fee based service soon that does more with girdle.
Thicker girdles can sometimes improve diamond beauty and sometimes reduce it - it is non obvious.
 

gr8foolishness

Rough_Rock
Joined
Dec 19, 2001
Messages
7
Thanks for your reply-although I still have a couple of questions. I read your tutorial on spread, I understand the concept, but how is it calculated? And what measurement constitutes a thin, medium, and thick girdle-and is that measurement from valley to valley or the thinnest and thickest part of the girdle?:confused:
 

gr8foolishness

Rough_Rock
Joined
Dec 19, 2001
Messages
7
Thanks again-so it seems that the GIA says girdle thickness is relative to the size of the stone-yet then there is actually a constant and you can do the math and figure out whether the girdle is thin, medium, thick-my main question is the math-the girdle number on a Sarin report is listed as a % of the diameter of the diamond? If I take the girdle measurement of 1.4% on a diamond that is 5.71mm in diameter, the girdle would be .07994mm-this doesn't make sense with the graphs in the article-what am I doing wrong? Help!:confused:
 

Garry H (Cut Nut)

Super_Ideal_Rock
Trade
Joined
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15,306
Gr8 are you buying certified diamonds or about to start your own lab?
These decisions are made differently by different labs with different rules etc.
I think you should communicaate directly with the labs because I may well wrongly advise you on such very specific questions.
if your questions concern the purchase of a diamond then I really feel you are in way to deep in your line of enquiry. If that is the case then you are possibly going to end up buying an 8* and you will be devastated when you see the girdle.
Garry
 

gr8foolishness

Rough_Rock
Joined
Dec 19, 2001
Messages
7
Maybe I am not phrasing my question correctly-what constitues a medium girdle-i.e.since you can't use %'s to determine a girdle rating(thin,medium,thick)is there a range of measurement .5mm, 1mm, 1.5mm, etc. that would be medium?
 
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