How could 6.90x6.98x4.17 be EX?

[Blueman33]

I am really confused. How can 6.90-6.98 rate as EX GIA symmetry?

??????

 

[oldminer]

Is this a round or a rectangle/near square sort of stone?

 

[Rhino]

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On 9/20/2004 2:58:40 PM Blueman33 wrote:





I am really confused. How can 6.90-6.98 rate as EX GIA symmetry?

??????
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The length/width measurements have no bearing on a symmetry grade. Facet placement/alignment does.

 

[Blueman33]

This is a round stone.

Just seems like .09 is a lot to be off, but as you can tell, I don't really understand it.

and i'm sure no one would be able to see 9/100's of a mm.

 

[oldminer]

An assymetrical round, an out of round diamond, certainly can have a symmetry issue. Would a round diamond with that much out of roundness get EX on a GIA report?


It sure wouldn't seem right to me. Obviously, an oval diamond can have EX symmetry with a different length and width, but would a so-called round with that kind of measurement still get EX?

 

[Garry H (Cut Nut)]

Distortion Allowable magnitude for GOOD
GIA (USA)Out-of-round girdle cannot be noticed with the naked eye.

I think GIA EX is max 1%
Is that correct?