Looking for the perfect diamond size and carat weight match? Our complete MM Size to Carat Weight chart makes it easy to understand the relationship between millimeter measurements and corresponding diamond carat values. Whether you're shopping for an engagement ring, custom jewelry, or gemstones, these accurate size guides help you make informed decisions. From 0.8 mm to 16 mm, our charts cover a full range of sizes—from 0.0025 ct to over 16 ct. Ideal for jewelers, gemologists, and savvy buyers, this tool ensures clarity and confidence in your selection. Optimize your jewelry shopping experience today!
Chart 1
|
MM Size
|
Carat Weight
|
|
4 mm.
|
0.25 ct.
|
|
5.0 mm.
|
0.50 ct.
|
|
5.75 mm.
|
0.75 ct.
|
|
6.5 mm.
|
1.00 ct.
|
|
6.8 mm.
|
1.25 ct.
|
|
7.3 mm.
|
1.50 ct.
|
|
7.75 mm.
|
1.75 ct.
|
|
8 mm.
|
2.00 ct.
|
|
8.7 mm.
|
2.50 ct.
|
|
9.1 mm.
|
3.00 ct.
|
|
9.75 mm.
|
3.50 ct.
|
|
10.25 mm.
|
4.00 ct.
|
|
10.75 mm.
|
4.50 ct.
|
|
11 mm.
|
5.00 ct.
|
Chart 2
|
MM Size
|
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.
|
Chart 3
|
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.
|
3.50 ct.
|
|
10 mm.
|
3.87 ct.
|
|
10.25 mm.
|
4.00 ct.
|
|
10.5 mm.
|
4.41 ct.
|
|
10.75 mm.
|
4.50 ct.
|
|
11 mm.
|
5.00 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.
|
