Diamond Size Chart | Compare Carat to MM Guide Online

Round MM Size	Round Carat Weight
0.8 mm	0.0025 ct
1 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 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	3.61 ct
10 mm	3.87 ct
10.25 mm	4.16 ct
10.5 mm	4.41 ct
10.75 mm	4.57 ct
11 mm	4.91 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

Princess MM Size	Princess Carat Weight
1.5 mm	0.015 ct
1.75 mm	0.03 ct
2 mm	0.06 ct
2.25 mm	0.08 ct
2.5 mm	0.10 ct
2.75 mm	0.13 ct
3 mm	0.18 ct
3.25 mm	0.26 ct
3.5 mm	0.29 ct
3.75 mm	0.31 ct
4 mm	0.39 ct
4.25 mm	0.44 ct
4.5 mm	0.50 ct
4.75 mm	0.64 ct
5 mm	0.75 ct
5.25 mm	0.90 ct
5.5 mm	1.00 ct
5.75 mm	1.11 ct
6 mm	1.25 ct

Princess MM Size	Princess Carat Weight
6.5 mm	1.50 ct
6.75 mm	1.75 ct
7 mm	2.00 ct
7.25 mm	2.01 ct
7.5 mm	2.50 ct
7.75 mm	2.74 ct
8 mm	3.00 ct
8.25 mm	3.24 ct
8.5 mm	3.67 ct
8.75 mm	4.10 ct
9 mm	4.12 ct
9.5 mm	5.09 ct
9.75 mm	5.36 ct
10 mm	5.62 ct
10.25 mm	5.76 ct
10.5 mm	5.99 ct
11 mm	7.44 ct
11.5 mm	9.44 ct
12 mm	9.52 ct

Asscher MM Size	Asscher Carat Weight
4 mm	0.39 ct
4.5 mm	0.50 ct
5 mm	0.75 ct
5.5 mm	1.00 ct
6 mm	1.25 ct
6.5 mm	1.50 ct
7 mm	2.00 ct
7.5 mm	2.50 ct
8 mm	3.00 ct
8.5 mm	3.50 ct
9 mm	4.12 ct
9.5 mm	5.09 ct
10 mm	5.62 ct
11 mm	7.44 ct
12 mm	9.52 ct
13 mm	12.66 ct

Radiant MM Size	Radiant Carat Weight
5x3 mm	0.31 ct
4.5x3.5 mm	0.34 ct
6x3 mm	0.41 ct
6x4 mm	0.50 ct
6.5x4.5 mm	0.75 ct
7x5 mm	1.00 ct
7.3x5.5 mm	1.25 ct
7.5x5.8 mm	1.50 ct
8x6 mm	2.00 ct
8.5x6.5 mm	2.25 ct
9x7 mm	2.50 ct
9.5x7.5 mm	3.00 ct
10x7 mm	3.31 ct
10x8 mm	3.50 ct
11x9 mm	5.05 ct
12x9 mm	6.06 ct
11.5x10 mm	6.45 ct
13x9 mm	6.54 ct
12x10 mm	6.79 ct
14x10 mm	8.47 ct
13x11 mm	9.33 ct
13.5x11.5 mm	10.19 ct
15x11 mm	11.48 ct
14x12 mm	12.14 ct
16x12 mm	14.22 ct

Cushion MM Size	Cushion Carat Weight
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 mm	1.25 ct
6.5 mm	1.50 ct
7 mm	2.00 ct
7.5 mm	2.50 ct
8 mm	3.00 ct
8.5 mm	3.50 ct
9 mm	4.12 ct
9.5 mm	5.09 ct
10 mm	5.62 ct
11 mm	7.44 ct
12 mm	9.52 ct
13 mm	12.66 ct

Emerald MM Size	Emerald Carat Weight
3x2 mm	0.10 ct
3.5x2 mm	0.12 ct
4x2 mm	0.15 ct
4x3 mm	0.20 ct
5x3 mm	0.29 ct
5.5x3.5 mm	0.46 ct
6x4 mm	0.50 ct
6.5x4.5 mm	0.75 ct
6.7x4.5 mm	0.88 ct
7x5 mm	1.00 ct
7.3x5.3 mm	1.25 ct
7.5x5.5 mm	1.50 ct
8x6 mm	1.75 ct
8.5x6.5 mm	2.00 ct
9x7 mm	2.50 ct
10x7.5 mm	3.00 ct
9.5x7.5 mm	3.21 ct
10x8 mm	3.79 ct
11x9 mm	5.21 ct
12x10 mm	6.00 ct
14x8 mm	6.25 ct
13x9 mm	6.38 ct
14x10 mm	8.48 ct
13x11 mm	9.13 ct
14x12 mm	11.26 ct
16x12 mm	14.22 ct

Marquise MM Size	Marquise Carat Weight
3x1.5 mm	0.025 ct
3.5x1.75 mm	0.065 ct
3.5x2 mm	0.07 ct
4x2 mm	0.10 ct
3.75x1.75 mm	0.11 ct
4.25x2.25 mm	0.12 ct
5x2.5 mm	0.14 ct
5.5x2.75 mm	0.16 ct
5.5x3 mm	0.18 ct
5x3 mm	0.20 ct
6.5x3 mm	0.23 ct
6x3 mm	0.25 ct
7x3 mm	0.30 ct
7.5x3.5 mm	0.33 ct
7x4 mm	0.34 ct
8x4 mm	0.50 ct
8.75x4.25 mm	0.70 ct
9x4.5 mm	0.75 ct

Marquise MM Size	Marquise Carat Weight
9.5x4.7 mm	0.85 ct
10x5 mm	1.00 ct
11x5.5 mm	1.25 ct
11.5x6 mm	1.33 ct
12x6 mm	1.50 ct
13x6.5 mm	2.00 ct
14x7 mm	2.50 ct
15x7 mm	3.00 ct
14x8 mm	3.00 ct
15x7.5 mm	3.25 ct
15x8 mm	3.44 ct
16x8 mm	3.86 ct
16.5x8.25 mm	4.00 ct
17x8.5 mm	4.88 ct
17.5x10 mm	5.50 ct
20x8 mm	7.08 ct
20x10 mm	7.94 ct
20x11 mm	9.50 ct

Oval MM Size	Oval Carat Weight
3.6x2.7 mm	0.10 ct
4x3 mm	0.15 ct
4.5x3.5 mm	0.20 ct
5x3.5 mm	0.25 ct
5.5x3.5 mm	0.33 ct
5x4 mm	0.35 ct
6x4 mm	0.50 ct
6x5 mm	0.61 ct
6.5x4.5 mm	0.65 ct
7x5 mm	0.75 ct
7.7x5.7 mm	1.00 ct
8x6 mm	1.25 ct
9x6 mm	1.41 ct
8.5x6.5 mm	1.50 ct
9x7 mm	2.00 ct
10x8 mm	2.50 ct
10.5x8.5 mm	2.88 ct
12x8 mm	3.00 ct
11x9 mm	3.85 ct
12x10 mm	5.05 ct
14x10 mm	5.81 ct
13x11 mm	6.05 ct
14x12 mm	8.21 ct
15x12 mm	8.76 ct
16x12 mm	9.32 ct
16x14 mm	11.88 ct
18x13 mm	12.86 ct
20x15 mm	14.96 ct

Pear MM Size	Pear Carat Weight
3x2 mm	0.13 ct
4x2.5 mm	0.18 ct
4x3 mm	0.21 ct
5x3 mm	0.25 ct
5x4 mm	0.35 ct
6x4 mm	0.50 ct
6.5x4.5 mm	0.60 ct
7x5 mm	0.75 ct
7.5x5.5 mm	0.85 ct
7.7x5.7 mm	1.00 ct
8x6 mm	1.25 ct
8.5x6.5 mm	1.50 ct
10x6 mm	1.71 ct
8.7x6.7 mm	1.80 ct
9x7 mm	2.00 ct
10x8 mm	2.50 ct
11x7.50 mm	2.61 ct
11x8 mm	2.70 ct
12x8 mm	3.00 ct

Pear MM Size	Pear Carat Weight
12x7 mm	3.12 ct
13x8 mm	3.40 ct
12x9 mm	3.44 ct
14x8 mm	4.00 ct
13x9 mm	4.11 ct
14x9 mm	4.25 ct
15x9 mm	5.06 ct
14x10 mm	5.41 ct
13x11 mm	5.65 ct
15x10 mm	5.75 ct
16x9 mm	5.86 ct
16x10 mm	6.27 ct
17x10 mm	6.46 ct
15x11 mm	7.36 ct
18x11 mm	8.14 ct
16x12 mm	8.99 ct
18x12 mm	9.35 ct
18x13 mm	10.21 ct

Heart MM Size	Heart Carat Weight
3.5 mm	0.18 ct
4 mm	0.25 ct
4.25 mm	0.28 ct
4.5 mm	0.34 ct
4.75 mm	0.38 ct
5 mm	0.50 ct
5.5 mm	0.61 ct
6 mm	0.75 ct
6.25 mm	0.83 ct
6.5 mm	1.00 ct
7 mm	1.25 ct
7.5 mm	1.50 ct
8 mm	2.00 ct
8.5 mm	2.50 ct
9 mm	3.00 ct
10 mm	3.50 ct
11 mm	4.41 ct
12 mm	5.66 ct
13 mm	7.88 ct
14 mm	9.38 ct
15 mm	10.79 ct
16 mm	13.27 ct
18 mm	15.33 ct