Diamond Size Guide: MM to Carat Chart for Round, Oval & More – Adorn By You - Timeless Elegance

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Diamond Size Chart

Understanding the millimeter (mm) size of each diamond shape helps you visualize the actual appearance of carat weight on a hand.

Select your diamond shape

MM Size (Diameter)	Carat Weight
0.8 mm	0.0025 ct.
1.0 mm	0.005 ct.
1.1 mm	0.0067 ct.
1.2 mm	0.009 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.
2.0 mm	0.03 ct.
2.2 mm	0.04 ct.
2.5 mm	0.06 ct.
2.75 mm	0.08 ct.
3.0 mm	0.10 ct.
3.25 mm	0.14 ct.
3.5 mm	0.17 ct.
3.75 mm	0.21 ct.
4.0 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.
6.0 mm	0.84 ct.
6.25 mm	0.93 ct.
6.5 mm	1.00 ct.
6.8 mm	1.25 ct.
7.0 mm	1.30 ct.
7.3 mm	1.50 ct.
7.5 mm	1.67 ct.
7.75 mm	1.75 ct.
8.0 mm	2.00 ct.
8.25 mm	2.11 ct.
8.5 mm	2.43 ct.
8.7 mm	2.50 ct.
9.0 mm	2.75 ct.
9.1 mm	3.00 ct.
9.5 mm	3.35 ct.
9.75 mm	3.50 ct.
10.0 mm	3.87 ct.
10.25 mm	4.00 ct.
10.5 mm	4.41 ct.
10.75 mm	4.50 ct.
11.0 mm	5.00 ct.
11.25 mm	5.49 ct.
11.5 mm	5.85 ct.
12.0 mm	6.84 ct.
12.25 mm	7.26 ct.
12.5 mm	7.36 ct.
12.75 mm	7.52 ct.
13.0 mm	8.51 ct.
13.5 mm	9.53 ct.
14.0 mm	10.49 ct.
15.0 mm	12.89 ct.
16.0 mm	16.06 ct.

MM Size	Carat Weight
1.5 mm	0.015 ct.
1.75 mm	0.03 ct.
2.0 mm	0.06 ct.
2.25 mm	0.08 ct.
2.5 mm	0.10 ct.
2.75 mm	0.13 ct.
3.0 mm	0.18 ct.
3.25 mm	0.25 ct.
3.5 mm	0.29 ct.
3.75 mm	0.31 ct.
4.0 mm	0.39 ct.
4.25 mm	0.44 ct.
4.5 mm	0.50 ct.
4.75 mm	0.64 ct.
5.0 mm	0.75 ct.
5.25 mm	0.90 ct.
5.5 mm	1.00 ct.
5.75 mm	1.11 ct.
6.0 mm	1.25 ct.
6.25 mm	1.39 ct.
6.5 mm	1.50 ct.
6.75 mm	1.75 ct.
7.0 mm	2.00 ct.
7.25 mm	2.01 ct.
7.5 mm	2.50 ct.
7.75 mm	2.74 ct.
8.0 mm	3.00 ct.
8.25 mm	3.24 ct.
8.5 mm	3.50 ct.
8.75 mm	4.00 ct.
9.25 mm	4.50 ct.
9.5 mm	5.00 ct.
9.75 mm	5.36 ct.
10.0 mm	5.62 ct.
10.25 mm	5.76 ct.
10.5 mm	5.99 ct.
11.0 mm	7.44 ct.
11.5 mm	9.44 ct.
12.0 mm	9.52 ct.

MM Size	Carat Weight
3.25 mm	0.25 ct.
4.2 mm	0.40 ct.
4.9 mm	0.50 ct.
5.25 mm	0.75 ct.
5.5 mm	1.00 ct.
6.0 mm	1.25 ct.
6.5 mm	1.50 ct.
6.75 mm	1.75 ct.
7.0 mm	2.00 ct.
7.5 mm	2.50 ct.
8.0 mm	3.00 ct.
8.5 mm	3.50 ct.
9.0 mm	4.00 ct.
9.3 mm	4.50 ct.
9.5 mm	5.00 ct.
10.0 mm	5.62 ct.
11.0 mm	7.44 ct.
12.0 mm	9.52 ct.
13.0 mm	12.66 ct.

MM Size (L x W)	Carat Weight
3.6 x 2.7 mm	0.10 ct.
4.0 x 3.0 mm	0.15 ct.
4.5 x 3.5 mm	0.20 ct.
5.0 x 3.0 mm	0.25 ct.
5.5 x 3.5 mm	0.33 ct.
5.0 x 4.0 mm	0.35 ct.
6.0 x 4.0 mm	0.50 ct.
6.0 x 5.0 mm	0.61 ct.
6.5 x 4.5 mm	0.65 ct.
7.0 x 5.0 mm	0.75 ct.
7.7 x 5.7 mm	1.00 ct.
8.0 x 6.0 mm	1.25 ct.
9.0 x 6.0 mm	1.41 ct.
8.5 x 6.5 mm	1.50 ct.
9.0 x 6.5 mm	1.75 ct.
9.0 x 7.0 mm	2.00 ct.
10.0 x 8.0 mm	2.50 ct.
10.5 x 8.5 mm	2.88 ct.
12.0 x 8.0 mm	3.00 ct.
12.0 x 8.5 mm	3.50 ct.
11.0 x 9.0 mm	3.85 ct.
12.5 x 8.5 mm	4.00 ct.
12.75 x 8.5 mm	4.50 ct.
12.0 x 10.0 mm	5.00 ct.
14.0 x 10.0 mm	5.81 ct.
13.0 x 11.0 mm	6.05 ct.
14.0 x 12.0 mm	8.21 ct.
15.0 x 12.0 mm	8.76 ct.
16.0 x 12.0 mm	9.32 ct.
16.0 x 14.0 mm	11.88 ct.
18.0 x 13.0 mm	12.86 ct.
20.0 x 15.0 mm	14.96 ct.

MM Size (L x W)	Carat Weight
3.0 x 2.0 mm	0.13 ct.
4.0 x 2.5 mm	0.18 ct.
4.0 x 3.0 mm	0.21 ct.
5.0 x 3.0 mm	0.25 ct.
5.0 x 4.0 mm	0.35 ct.
6.0 x 4.0 mm	0.50 ct.
6.5 x 4.5 mm	0.60 ct.
7.0 x 5.0 mm	0.75 ct.
7.5 x 5.5 mm	0.85 ct.
7.7 x 5.7 mm	1.00 ct.
8.0 x 6.0 mm	1.25 ct.
8.5 x 6.5 mm	1.50 ct.
10.0 x 6.0 mm	1.75 ct.
8.7 x 6.7 mm	1.80 ct.
9.0 x 7.0 mm	2.00 ct.
10.0 x 8.0 mm	2.50 ct.
11.0 x 7.50 mm	2.61 ct.
11.0 x 8.0 mm	2.70 ct.
12.0 x 8.0 mm	3.00 ct.
12.0 x 7.0 mm	3.12 ct.
13.0 x 8.0 mm	3.40 ct.
12.0 x 9.0 mm	3.50 ct.
14.0 x 8.0 mm	4.00 ct.
13.0 x 9.0 mm	4.11 ct.
14.0 x 9.0 mm	4.25 ct.
14.5 x 9.0 mm	4.50 ct.
15.0 x 9.0 mm	5.00 ct.
14.0 x 10.0 mm	5.41 ct.
13.0 x 11.0 mm	5.65 ct.
15.0 x 10.0 mm	5.75 ct.
16.0 x 9.0 mm	5.86 ct.
16.0 x 10.0 mm	6.27 ct.
17.0 x 10.0 mm	6.46 ct.
15.0 x 11.0 mm	7.36 ct.
18.0 x 11.0 mm	8.14 ct.
16.0 x 12.0 mm	8.99 ct.
18.0 x 12.0 mm	9.35 ct.
18.0 x 13.0 mm	10.21 ct.

MM Size (L x W)	Carat Weight
4.3 x 3.0 mm	0.25 ct.
4.5 x 3.5 mm	0.34 ct.
6.0 x 3.0 mm	0.41 ct.
6.0 x 4.0 mm	0.50 ct.
6.5 x 4.5 mm	0.75 ct.
7.0 x 5.0 mm	1.00 ct.
7.3 x 5.5 mm	1.25 ct.
7.5 x 5.8 mm	1.50 ct.
8.0 x 6.0 mm	1.75 ct.
8.2 x 6.2 mm	2.00 ct.
8.5 x 6.5 mm	2.25 ct.
9.0 x 7.0 mm	2.50 ct.
9.5 x 7.5 mm	3.00 ct.
10.0 x 7.0 mm	3.31 ct.
10.0 x 8.0 mm	3.50 ct.
10.2 x 8.2 mm	4.00 ct.
10.5 x 8.5 mm	4.50 ct.
11.0 x 9.0 mm	5.00 ct.
12.0 x 9.0 mm	6.06 ct.
11.5 x 10.0 mm	6.45 ct.
13.0 x 9.0 mm	6.54 ct.
13.2 x 9.2 mm	6.79 ct.
14.0 x 10.0 mm	8.47 ct.
13.0 x 11.0 mm	9.33 ct.
13.5 x 11.5 mm	10.19 ct.
15.0 x 11.0 mm	11.48 ct.
14.0 x 12.0 mm	12.14 ct.
16.0 x 12.0 mm	14.22 ct.

MM Size (L x W)	Carat Weight
3 x 1.5 mm	0.025 ct.
3.5 x 1.75 mm	0.065 ct.
3.5 x 2 mm	0.07 ct.
4 x 2 mm	0.10 ct.
3.75 x 1.75 mm	0.11 ct.
4.25 x 2.25 mm	0.12 ct.
5 x 2.5 mm	0.14 ct.
5.5 x 2.75 mm	0.16 ct.
5.5 x 3 mm	0.18 ct.
5 x 3 mm	0.20 ct.
6.5 x 3 mm	0.23 ct.
6 x 3 mm	0.25 ct.
7 x 3 mm	0.30 ct.
7.5 x 3.5 mm	0.33 ct.
7 x 4 mm	0.34 ct.
8 x 4 mm	0.50 ct.
8.75 x 4.25 mm	0.70 ct.
9 x 4.5 mm	0.75 ct.
9.5 x 4.7 mm	0.85 ct.
10 x 5 mm	1.00 ct.
11 x 5.5 mm	1.25 ct.
11.5 x 6 mm	1.33 ct.
12 x 6 mm	1.50 ct.
12.5 x 6.25 mm	1.75 ct.
13 x 6.5 mm	2.00 ct.
14 x 7 mm	2.50 ct.
15 x 7 mm	3.00 ct.
15 x 7.5 mm	3.25 ct.
15 x 8 mm	3.50 ct.
16 x 8 mm	3.86 ct.
16.5 x 8.25 mm	4.00 ct.
16.75 x 8.5 mm	4.50 ct.
17 x 8.5 mm	5.00 ct.
17.5 x 10 mm	5.50 ct.
20 x 8 mm	7.08 ct.
20 x 10 mm	7.94 ct.
20 x 11 mm	9.50 ct.

MM Size (Length x Width)	Carat Weight
3 x 2 mm	0.10 ct.
3.5 x 2 mm	0.12 ct.
4 x 2 mm	0.15 ct.
4 x 3 mm	0.20 ct.
4.30 x 3 mm	0.25 ct.
5 x 3 mm	0.29 ct.
5.5 x 3.5 mm	0.46 ct.
6 x 4 mm	0.50 ct.
6.5 x 4.5 mm	0.75 ct.
6.7 x 4.5 mm	0.88 ct.
7 x 5 mm	1.00 ct.
7.3 x 5.3 mm	1.25 ct.
7.5 x 5.5 mm	1.50 ct.
8 x 6 mm	1.75 ct.
8.5 x 6.5 mm	2.00 ct.
9 x 7 mm	2.50 ct.
9.3 x 7.5 mm	3.00 ct.
9.5 x 7.5 mm	3.21 ct.
9.75 x 7.7 mm	3.50 ct.
9.9 x 7.8 mm	3.79 ct.
10 x 8 mm	4.00 ct.
10.5 x 8.5 mm	4.50 ct.
11 x 9 mm	5.00 ct.
12 x 8 mm	5.34 ct.
12 x 10 mm	6.00 ct.
14 x 8 mm	6.25 ct.
14 x 9 mm	6.38 ct.
14 x 10 mm	8.48 ct.
13 x 11 mm	9.13 ct.
14 x 12 mm	11.26 ct.
16 x 12 mm	14.22 ct.

MM Size	Carat Weight
3.5 mm	0.18 ct.
4.0 mm	0.25 ct.
4.25 mm	0.28 ct.
4.5 mm	0.34 ct.
4.75 mm	0.38 ct.
5.0 mm	0.50 ct.
5.5 mm	0.61 ct.
6.0 mm	0.75 ct.
6.25 mm	0.83 ct.
6.5 mm	1.00 ct.
7.0 mm	1.25 ct.
7.5 mm	1.50 ct.
7.7 mm	1.75 ct.
8.0 mm	2.00 ct.
8.5 mm	2.50 ct.
9.0 mm	3.00 ct.
10.0 mm	3.50 ct.
10.5 mm	4.00 ct.
11.0 mm	4.50 ct.
11.5 mm	5.00 ct.
12.0 mm	5.66 ct.
13.0 mm	7.88 ct.
14.0 mm	9.38 ct.
15.0 mm	10.79 ct.
16.0 mm	13.27 ct.
18.0 mm	15.33 ct.

MM Size	Carat Weight
3.25 mm	0.25 ct.
4.0 mm	0.39 ct.
4.5 mm	0.50 ct.
5.0 mm	0.75 ct.
5.5 mm	1.00 ct.
6.0 mm	1.25 ct.
6.5 mm	1.50 ct.
6.7 mm	1.75 ct.
7.0 mm	2.00 ct.
7.5 mm	2.50 ct.
8.0 mm	3.00 ct.
8.5 mm	3.50 ct.
9.0 mm	4.00 ct.
9.25 mm	4.50 ct.
9.5 mm	5.00 ct.
10.0 mm	5.62 ct.
11.0 mm	7.44 ct.
12.0 mm	9.52 ct.
13.0 mm	12.66 ct.

*Measurements are approximate. Final dimensions may vary based on cut grade and depth percentage.

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