Lovely ring. Graff -- they do a nice job!
The bigger the stone, the less noticeable a one-ct difference will be, of course.
A 33% increase in weight (going from 3 to 4 ct) is only a 9% increase in diameter -- assuming identical proportions.
Going from 4 to 5 ct is only a 7.7% increase in diameter, etc. That must be why 5-ct size is so unpopular .
I did not know this. So interesting. Thanks for sharing the numbers. So interesting that the 5 carat mark is one of those points where the price jumps considerably (the other big price jump is when you break the 1 carat mark).