Princess Diamond Size Chart

Actual mm dimensions for princess diamonds at every carat weight.

Round

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Princess Sizes

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MM Size	Carat Weight
3.3 x 3.3 mm	0.25 ct
3.6 x 3.6 mm	0.33 ct
4.2 x 4.2 mm	0.5 ct
4.5 x 4.5 mm	0.6 ct
4.9 x 4.9 mm	0.75 ct
5.2 x 5.2 mm	0.9 ct
5.5 x 5.5 mm	1 ct
5.9 x 5.9 mm	1.25 ct
6.3 x 6.3 mm	1.5 ct

MM Size	Carat Weight
6.6 x 6.6 mm	1.75 ct
7 x 7 mm	2 ct
7.5 x 7.5 mm	2.5 ct
7.9 x 7.9 mm	3 ct
8.3 x 8.3 mm	3.5 ct
8.7 x 8.7 mm	4 ct
9 x 9 mm	4.5 ct
9.3 x 9.3 mm	5 ct

Approximate dimensions for well-cut stones. Always verify against the grading report.

About princess diamond measurements

These are approximate face-up dimensions for well-cut princess diamonds with standard proportions. Actual size depends on cut depth, girdle thickness, and length-to-width ratio choices.

Always check the specific mm measurements on the grading report before buying. A stone that's technically 1 carat but cut deep will look noticeably smaller than one cut to proper proportions.