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?
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.
Sarasota Gemological Laboratory
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