Convert

CARAT TO MM

MID professional tool to Converter Carat to mm / mm to carat weight

helps to approximately determine the diamond size on a finger.
See below the equivalent 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 cut 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.
Cushion cut diamond with soft, rounded edges
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 diamond ring
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 cut diamond ring
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
Oval cut diamond ring
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!
Example of a Princess cut diamond to show the mm to carat conversion section for this kind of cut.
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
Asscher cut diamond
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 cut 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 Shape 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 cut 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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CARAT TO MM

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