Join MID House of Diamonds at the HKTDC Hong Kong International Diamond, Gem & Pearl Show 2025 and enjoy exposure to the global jewelry industry, with its continuing high demand for white and fancy color diamonds, pearls and high-end diamond jewelry.
Please call +852-2-545-7118 or send us an email at [email protected] to schedule an appointment or to request a copy of our latest custom design catalog.
MID House of Diamonds will be among the exhibitors at the June 2020 JCK Vegas Show. Come say Hi!
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Understanding the link between carat weight and mm size is key to choosing the perfect diamond. While carat measures weight, shape and cut affect its appearance. This guide offers a precise MM to Carat and CT to MM conversion chart to help you compare and decide confidently
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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.
|
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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