Heart Diamond Size Chart

Actual mm dimensions for heart diamonds at every carat weight.

Round

How big is act Heart?

Heart Sizes

Shape guide →

MM Size	Carat Weight
3.8 x 3.8 mm	0.25 ct
4.2 x 4.2 mm	0.33 ct
5 x 5 mm	0.5 ct
5.4 x 5.4 mm	0.6 ct
5.8 x 5.8 mm	0.75 ct
6.2 x 6.2 mm	0.9 ct
6.5 x 6.5 mm	1 ct
6.9 x 6.9 mm	1.25 ct
7.4 x 7.4 mm	1.5 ct

MM Size	Carat Weight
7.7 x 7.7 mm	1.75 ct
8.1 x 8.1 mm	2 ct
8.6 x 8.6 mm	2.5 ct
9.2 x 9.2 mm	3 ct
9.6 x 9.6 mm	3.5 ct
10 x 10 mm	4 ct
10.4 x 10.4 mm	4.5 ct
10.8 x 10.8 mm	5 ct

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

About heart diamond measurements

These are approximate face-up dimensions for well-cut heart 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.