Diamonds can be measured in both carat weight and millimeter. While diamonds are purchased based on carat weight — the standard unit of measurement for loose diamonds — it’s important to consider millimeter measurements and ratios to choose the best possible option for your budget.
Round Cut Diamond Size Chart (MM)
Wondering what a 1 carat round diamond looks link on a hand? Our round diamond size chart will help you convert millimeter (mm) size to carat size for round cut diamonds.
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. |