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Round Cut Diamond Size Chart (MM)

Wondering what a 1 carat round  Gemstone looks link on a hand? Our round Gemstone size chart will help you convert millimeter (mm) size to carat size for round cut Gemstone.

Round Diamond Sizes

Round MM SizeRound 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 SizeRound 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.

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