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Diamond size by carat
A well-cut round diamond of 0.5 ct is about 5.2 mm across, 1 ct about 6.5 mm, 1.5 ct about 7.4 mm and 2 ct about 8.2 mm. One carat is 0.2 grams; a deep cut can weigh the same and look smaller face up.
How to use it
- Pick the carat weight on the listing.
- See the typical face-up diameter of a well-cut round.
- Compare it to scale with a US dime.
Pieces that fit
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Buy now goes straight to checkout with just that piece. Each piece's own page has its full details.
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A general guide. Brands cut and finish differently, so each piece’s own size chart and details win.