Out of Round?

[brenn4423]

Can anyone explain what constitutes "out of round." I realize it means when a RB is not round enough and thus is visually oblong. Obviously most diamonds are not exact circles... but are fairly close (i.e 7.58-7.60). I also can rationally figure that the bigger the diamond the more room there is in being not exactly round and still looking round. This is a drastic example but if a quarter is 0.3 mm longer on one diameter axis than the other no one would probably notice, but a 0.3mm difference in a diamond would be huge and result as an oval. (6.5-6. With this said, is there a rule of thumb when something becomes "out of round"?

Would this diamond be "out of round": Diamensions: 7.58-7.65

 

[Garry H (Cut Nut)]

it is less than 1% out of round
check this http://www.gemology.ru/cut/english/symmetry/5.htm

 

[brenn4423]

Hey Garry H, Looking at the website you provided would make me believe that less than 1 (as you indicated the provided measurements are) would pass all three of the tests for not being "out of round". It is clearly under .1mm difference, it is under 4% and I''m guessing that it is also not visible? Would this be right?

 

[brenn4423]

Below is the diamond that I got the 7.58-7.65 measurements from. It indicates that the sym is ideal. Does this mean that it is not "out of round"?

1.62 ct
Color: G
Clarity: VS2
HCA: 0.4-EX (ex-ex-ex-ex)
AGS: 0
Depth: 60.3%
Table: 56.8%
Crown: 34.1°
Pav: 40.5°
Grd: thn-sli thi
Pol: id
Sym: id
Flr: none
Dimensions: 7.58-7.65x4.59
AGS
James Allen Link: http://www.jamesallen.com/diamond.asp?b=16&a=12&cid=131&item=937926

 

[JulieN]

yes, it's fine.

technically speaking, the ratio is 1.01. but it is ok