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teh 20% rule or something? is it true?

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enibas

Rough_Rock
Joined
Nov 18, 2002
Messages
58
if you have two diamonds of the exact same quality (CUT, color, clarity) -- they will look the same "size" to the naked eye as long as the heavier one is no more than 20% larger than the smaller one...this has been paraphrased, but true or false? :read:
 

mike04456

Brilliant_Rock
Joined
Nov 20, 2002
Messages
1,441
Sounds like some kind of promotional tactic to me...

In reality, you're never going get two identical diamonds. Like fingerprints and snowflakes, no two are ever exactly the same. Even two stones cut from the same rough can look dramatically different.
 

Richard Sherwood

Ideal_Rock
Joined
Sep 25, 2002
Messages
4,924
I would have to answer "false".

I think the average person could easily spot a 20% difference in carat weight.

A 1.00 versus a 1.20, for example. Pretty easy to see. You're talking an approximate 6.5 mm spread versus a 6.9 mm spread. The eye and the brain, a duo of magnificent measuring instruments, can easily pick up a 4/10th's millimeter difference in spread.

Most experienced diamond people could spot a 1/10th mm difference in spread.

Rich, GG
Sarasota Gemological Laboratory
 
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