diamond size guide

Diamond Size Chart

A diamond carat size chart illustrates the link between carat weight and diamond dimensions in millimeters (mm). It provides a clear view of diamond sizes and shows how cut impacts appearance and sparkle.

Round MM Size	Round Carat Weight
4 mm	0.25 ct
5.0 mm	0.50 ct
5.75 mm	0.75 ct
6.5 mm	1.00 ct
6.8 mm	1.25 ct
7.3 mm	1.50 ct
7.75 mm	1.75 ct
8 mm	2.00 ct
8.7 mm	2.50 ct
9.1 mm	3.00 ct
9.75 mm	1.50 ct
7.3 mm	3.50 ct
10.25 mm	4.00 ct
10.75 mm	4.50 ct
11 mm	5.00 ct

Round MM Size	Round Carat Weight
3.6×2.7 mm	0.10 ct
4×3 mm	0.15 ct
1.1 mm	0.0067 ct
1.2 mm	0.0009 ct
1.25 mm	0.01 ct
1.3 mm	0.01 ct
1.5 mm	0.015 ct
1.75 mm	0.02 ct
1.8 mm	0.025 ct
2 mm	0.03 ct
2.2 mm	0.04 ct
2.5 mm	0.06 ct
2.75 mm	0.08 ct
3 mm	0.10 ct
3.25 mm	0.14 ct
3.5 mm	0.17 ct
3.75 mm	0.21 ct
4 mm	0.25 ct
4.25 mm	0.28 ct
4.5 mm	0.36 ct
4.75 mm	0.44 ct
5.0 mm	0.50 ct
5.25 mm	0.56 ct
5.5 mm	0.66 ct
5.75 mm	0.75 ct
6 mm	0.84 ct
6.25 mm	0.93 ct
6.5 mm	1.00 ct
6.8 mm	1.25 ct

Round MM Size	Round Carat Weight
7 mm	1.30 ct
7.3 mm	1.50 ct
7.5 mm	1.67 ct
7.75 mm	1.75 ct
8 mm	2.00 ct
8.25 mm	2.11 ct
8.5 mm	2.43 ct
8.7 mm	2.50 ct
9 mm	2.75 ct
9.1 mm	3.00 ct
9.5 mm	3.35 ct
9.75 mm	3.50 ct
10 mm	3.87 ct
10.25 mm	4.00 ct
10.5 mm	4.41 ct
10.75 mm	4.50 ct
11 mm	5.00 ct
11.25 mm	5.49 ct
11.5 mm	5.85 ct
12 mm	6.84 ct
12.25 mm	7.26 ct
12.5 mm	7.36 ct
12.75 mm	7.52 ct
13 mm	8.51 ct
13.5 mm	9.53 ct
14 mm	10.49 ct
15 mm	12.89 ct
16 mm	16.06 ct