When we admire a diamond, we first notice the diameter size. How large the diamond looks "face up" is more important than the actual weight. Most people believe that weight and size are standard. That a one-carat diamond always has the same diameter.
However we know, (cut section page 6) that diamond cutters often retain extra weight in cutting a deeper pavilion and/or higher crown and/or thicker girdle, this results in a smaller diameter diamond as compared to a well proportioned Antwerp Ideal cut diamond of the same weight.
BOTH DIAMONDS WEIGH EXACTLY 1.00 CARAT
The Antwerp Ideal Diamond
Average Deep Diamond
Not only will a deep diamond look smaller, but as we know it will have a noticeable decrease in beauty.
Shallow cut stones will measure slightly larger, but their beauty diminishes much faster than with deeper stones.
Having learned about cut and its association to carat-weight, it should now be apparent that we pay for a diamond by weight, but judge it by size.
The Antwerp Ideal Has The Largest Possible Diameter For Its Weight With The Maximum Balance Of Brilliance and Fire
DIAMETERS AND CORRESPONDING WEIGHTS OF WELL PROPORTIONED DIAMONDS