mm to carat conversion guied

Brilliant round-cut diamond with reflective facets
Round Cut Conversion
Cushion Cut Cover
Cushion Cut Conversion
Pear-shaped diamond with a teardrop silhouette
Pear Cut Conversion
Emerald Cut Conversion
Oval-shaped diamond with an elongated, curved profile
Oval Cut Conversion
princess cut facets
Princess Cut Conversion
Asscher-cut diamonds in a refined setting
Asscher Cut Conversion
A picture of a diamond that visually explains what it is Radiant cuts
Radiant Cut Conversion
Heart-shaped diamond with a symmetrical cut
Heart Cut Conversion
Example of a Marquise cut diamond to show the mm to carat section for this kind of cut.
Marquise Cut Conversion

Understanding mm to carat and how diamond size in millimeters relates to carat weight is essential when choosing a diamond. Because shape and cut affect how a diamond appears, using an accurate mm to carat conversion chart helps you confidently compare sizes and weights for any diamond

Round Brilliant cut

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

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

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

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

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.

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Princess 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

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

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 Cut

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

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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