Marquise Diamond Size Chart

Actual mm dimensions for marquise diamonds at every carat weight.

Round

How big is act Marquise?

Marquise Sizes

Shape guide →

MM Size	Carat Weight
5.5 x 2.8 mm	0.25 ct
6.5 x 3.3 mm	0.33 ct
7.5 x 3.8 mm	0.5 ct
8 x 4 mm	0.6 ct
8.5 x 4.5 mm	0.75 ct
9.2 x 4.7 mm	0.9 ct
10 x 5 mm	1 ct
10.5 x 5.5 mm	1.25 ct
11.5 x 5.8 mm	1.5 ct

MM Size	Carat Weight
12 x 6 mm	1.75 ct
12.5 x 6.3 mm	2 ct
13.3 x 6.7 mm	2.5 ct
14 x 7 mm	3 ct
14.5 x 7.3 mm	3.5 ct
15 x 7.5 mm	4 ct
15.5 x 7.8 mm	4.5 ct
16 x 8 mm	5 ct

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

About marquise diamond measurements

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