How do gridle size affect the diamond

[peako]

i have been to some b & m shop to see lazare diamonds and hearts of fire..

Their cut seems to have slightly bigger girdle size of about 2.5 +- 0.3...

However it seems that diamonds listed with many vendors are less than 2.0

How does the girdle size affect the diamond..all things equal

 

[quaeritur]

I'm not an expert here... but, as far as I can tell, if the rest of the numbers are good, you won't see much difference in performance from a thicker girdle. However, you will lose spread (diameter) because much of the carat weight will be hidden in the thicker girdle. In other words, you'll be paying more for size you can't see. Hope that helps...

 

[chialea]

If it's too small (extremely thin) you'll have an increased chance of chipping, so you might want to put it in a protected setting. Besides that, you're just hiding diamond weight in a place you can't see it, so a girdle that's too much thicker tends to mean a diamond which looks smaller from the top than a well-cut stone. It's not going to make a real difference until you start getting into the "thick" and "extremely thick" ranges, though, iirc.

EDIT: heh, two non-experts simultaneously respond. at least we agree

 

[Garry H (Cut Nut)]

First - there are two ways or places to measure girdle thickness.

So be sure that what you are getting is the thinnest measurement - eg 1% is about the order of thin / medium, but 1% at the girdle valley = 2.7% at the main facet junction.

If the girdle is thicker than Slightly Thick, then you will have a reduced diameter or higher carat weight with no additional benefit.

However thick and very thick girdles have little impact on diamond beauty.