Convert

CARAT TO MM

Carat weight to Millimeter Converter is a professional tool that helps to approximately determine the diamond size on a finger.

See below the equivalent carat to mm size table for Round Brilliant Cut, Cushion Cut, Pear shape, Emerald Cut, Oval Cut, Princess Cut, Hear shape, Marquise cut, Asscher cut and Radiant cut.

Round Brilliant diamond
MM Size
Carat Weight
0.8 mm.
0.0025 ct.
1 mm.
0.005 ct.
1.15 mm.
0.0067 ct.
1.12 mm.
0.0075 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.
2.25 mm.
0.04 ct.
2.5 mm.
0.06 ct.
2.75 mm.
0.08 ct.
3 mm.
0.11 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.
MM Size
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.
Round Brilliant Diamond
MM Size
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.
MM Size
Carat Weight
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.
pear shape diamond
MM Size
Carat Weight
3×2 mm.
0.13 ct.
4×2.5 mm.
0.18 ct.
4×3 mm.
0.21 ct.
5×3 mm.
0.25 ct.
5×4 mm.
0.35 ct.
6×4 mm.
0.50 ct.
6.5×4.5 mm.
0.60 ct.
7×5 mm.
0.75 ct.
7.5×5.5 mm.
0.85 ct.
7.7×5.7 mm.
1.00 ct.
8×6 mm.
1.25 ct.
8.5×6.5 mm.
1.50 ct.
10×6 mm.
1.71 ct.
8.7×6.7 mm.
1.80 ct.
9×7 mm.
2.00 ct.
10×8 mm.
2.50 ct.
11×7.50 mm.
2.61 ct.
13×8 mm.
2.98 ct.
11×8 mm.
3.00 ct.
MM Size
Carat Weight
12×8 mm.
3.00 ct.
12×7 mm.
3.12 ct.
12×9 mm.
3.44 ct.
14×8 mm.
3.47 ct.
13×9 mm.
4.11 ct.
14×9 mm.
4.25 ct.
15×9 mm.
5.06 ct.
14×10 mm.
5.41 ct.
13×11 mm.
5.65 ct.
15×10 mm.
5.75 ct.
16×9 mm.
5.86 ct.
16×10 mm.
6.27 ct.
17×10 mm.
6.46 ct.
15×11 mm.
7.36 ct.
18×11 mm.
8.14 ct.
16×12 mm.
8.99 ct.
18×12 mm.
9.35 ct.
18×13 mm.
10.21 ct.

Fancy color diamonds

All about nature beautiful candies
emerald diamond
MM Size
Carat Weight
3×2 mm.
0.10 ct.
3.5×2 mm.
0.12 ct.
4×2 mm.
0.15 ct.
4×3 mm.
0.20 ct.
5×3 mm.
0.29 ct.
5.5×3.5 mm.
0.46 ct.
6×4 mm.
0.50 ct.
6.5×4.5 mm.
0.75 ct.
6.7×4.5 mm.
0.88 ct.
7×5 mm.
1.00 ct.
7.3×5.3 mm.
1.25 ct.
7.5×5.5 mm.
1.50 ct.
8×6 mm.
1.75 ct.
8.5×6.5 mm.
2.00 ct.
MM Size
Carat Weight
9×7 mm.
2.50 ct.
10×7.5 mm.
3.00 ct.
9.5×7.5 mm.
3.21 ct.
10×8 mm.
3.79 ct.
11×9 mm.
5.21 ct.
12×8 mm.
5.34 ct.
12×10 mm.
6.00 ct.
14×8 mm.
6.25 ct.
13×9 mm.
6.38 ct.
14×10 mm.
8.48 ct.
13×11 mm.
9.13 ct.
14×12 mm.
11.26 ct.
16×12 mm.
14.22 ct.

the magic of white natural diamonds

All about the sparks and shining stones
ovald diamond
MM Size
Carat Weight
4.5×3.5 mm.
0.21 ct.
5×3 mm.
0.21 ct.
5.5×3.5 mm.
0.33 ct.
5×4 mm.
0.35 ct.
6×4 mm.
0.50 ct.
6×5 mm.
0.61 ct.
6.5×4.5 mm.
0.65 ct.
7×5 mm.
0.75 ct.
7.7×5.7 mm.
1.00 ct.
8×6 mm.
1.25 ct.
9×6 mm.
1.41 ct.
8.5×6.5 mm.
1.50 ct.
9×7 mm.
2.00 ct.
MM Size
Carat Weight
10×8 mm.
2.50 ct.
10.5×8.5 mm.
2.88 ct.
12×8 mm.
3.00 ct.
11×9 mm.
3.85 ct.
12×10 mm.
5.05 ct.
14×10 mm.
5.81 ct.
13×11 mm.
6.05 ct.
14×12 mm.
8.21 ct.
15×12 mm.
8.76 ct.
16×12 mm.
9.32 ct.
16×14 mm.
11.88 ct.
18×13 mm.
12.86 ct.
20×15 mm.
14.96 ct.

diamond trade shows

Most important world wide diamond trade shows - of the year!
MM Size
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.
6.25 mm.
1.39 ct.
MM Size
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.

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Asscher cut
diamond asscher cut
MM Size
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.
MM Size
Carat Weight
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.

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Radiant cut
radiant shape diamond
MM Size
Carat Weight
5×3 mm.
0.31 ct.
4.5×3.5 mm.
0.34 ct.
6×3 mm.
0.41 ct.
6×4 mm.
0.50 ct.
6.5×4.5 mm.
0.75 ct.
7×5 mm.
1.00 ct.
7.3×5.5 mm.
1.25 ct.
7.5×5.8 mm.
1.50 ct.
8×6 mm.
2.00 ct.
8.5×6.5 mm.
2.25 ct.
9×7 mm.
2.50 ct.
9.5×7.5 mm.
3.00 ct.
10×7 mm.
3.31 ct.
MM Size
Carat Weight
10×8 mm.
3.50 ct.
11×9 mm.
5.05 ct.
12×9 mm.
6.06 ct.
11.5×10 mm.
6.45 ct.
13×9 mm.
6.54 ct.
12×10 mm.
6.79 ct.
14×10 mm.
8.47 ct.
13×11 mm.
9.33 ct.
13.5×11.5 mm.
10.19 ct.
15×11 mm.
11.48 ct.
14×12 mm.
12.14 ct.
16×12 mm.
14.22 ct.
heart diamond
MM Size
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.
MM Size
Carat Weight
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.

ORAFIN

A 200 CARAT ROUGH DIAMOND
Marquise cut
marquise shape diamond
MM Size
Carat Weight
3×1.5 mm.
0.025 ct.
3.5×1.75 mm.
0.065 ct.
3.5×2 mm.
0.07 ct.
4×2 mm.
0.10 ct.
3.75×1.75 mm.
0.11 ct.
4.25×2.25 mm.
0.12 ct.
5×2.5 mm.
0.14 ct.
5.5×2.75 mm.
0.16 ct.
5.5×3 mm.
0.18 ct.
5×3 mm.
0.20 ct.
6.5×3 mm.
0.23 ct.
6×3 mm.
0.25 ct.
7×3 mm.
0.30 ct.
7.5×3.5 mm.
0.33 ct.
7×4 mm.
0.34 ct.
8×4 mm.
0.50 ct.
8.75×4.25 mm.
0.70 ct.
9×4.5 mm.
0.75 ct.
MM Size
Carat Weight
9.5×4.7 mm.
0.85 ct.
10×5 mm.
1.00 ct.
11×5.5 mm.
1.25 ct.
11.5×6 mm.
1.33 ct.
12×6 mm.
1.50 ct.
13×6.5 mm.
2.00 ct.
14×7 mm.
2.50 ct.
15×7 mm.
3.00 ct.
14×8 mm.
3.00 ct.
15×7.5 mm.
3.25 ct.
15×8 mm.
3.44 ct.
16×8 mm.
3.86 ct.
16.5×8.25 mm.
4.00 ct.
17×8.5 mm.
4.88 ct.
17.5×10 mm.
5.50 ct.
20×8 mm.
7.08 ct.
20×10 mm.
7.94 ct.
20×11 mm.
9.50 ct.

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