Cushion Diamond Size Chart

Actual mm dimensions for cushion diamonds at every carat weight.

Round

How big is act Cushion?

Cushion Sizes

Shape guide →

MM Size	Carat Weight
3.5 x 3.5 mm	0.25 ct
3.8 x 3.8 mm	0.33 ct
4.5 x 4.5 mm	0.5 ct
4.8 x 4.8 mm	0.6 ct
5.2 x 5.2 mm	0.75 ct
5.5 x 5.5 mm	0.9 ct
5.8 x 5.8 mm	1 ct
6.2 x 6.2 mm	1.25 ct
6.7 x 6.7 mm	1.5 ct

MM Size	Carat Weight
7 x 7 mm	1.75 ct
7.3 x 7.3 mm	2 ct
7.8 x 7.8 mm	2.5 ct
8.2 x 8.2 mm	3 ct
8.6 x 8.6 mm	3.5 ct
9 x 9 mm	4 ct
9.4 x 9.4 mm	4.5 ct
9.8 x 9.8 mm	5 ct

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

About cushion diamond measurements

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