Diamond Carat Guide

Millimeter to Diamond Carat Weight Conversion Chart



Round
Approx. Millimeter
Approx. Carat Weight
4
0.25
5
0.5
6.5
1
7
1.25
7.5
1.5
8
2
9
2.5
9.5
3
9.7
3.5
10
4
10.5
4.5
11
5


Oval
Approx. Millimeter
Approx. Carat Weight
6.5 x 4.5
0.5
8 x 6
1
9 x 7
1.75
10 x 7
2
11 x 7.5
2.5
11.5 x 8
3
12.5 x 8.5
3.5
13 x 9
4
13.5 x 7
4.5
14 x 9.5
5


Cushion
Approx. Millimeter
Approx. Carat Weight
4.5
0.5
5.7
1
6.2
1.25
6.5
1.5
7.3
2
8
2.5
8.3
3
8.7
3.5
9
4
9.5
4.5
10
5


Princess
Approx. Millimeter
Approx. Carat Weight
4.4
0.5
5.5
1
5.9
1.25
6.3
1.5
7
2
7.5
2.5
8
3
8.3
3.5
8.7
4
9
4.5
9.3
5


Radiant
Approx. Millimeter
Approx. Carat Weight
4.3
0.5
5.5
1
6
1.25
6.5
1.5
7
2
7.5
2.5
8
3
8.5
3.5
8.8
4
9
4.5
9.5
5


Emerald
Approx. Millimeter
Approx. Carat Weight
5.5 x 4
0.5
7 x 4.5
1
7.5 x 5
1.25
8 x 5.5
1.5
8.5 x 6
2
9 x 6.5
2.5
9.7 x 7
3
10 x 7
3.5
10.7 x 7.5
4
11 x 6
4.5
11.5 x 8
5


Pear
Approx. Millimeter
Approx. Carat Weight
7 x 4.5
0.5
9 x 5.5
1
9.5 x 6
1.25
10 x 6.5
1.5
11 x 7
2
12 x 7.5
2.5
13 x 8
3
13.5 x 8.5
3.5
14.5 x 9
4
15 x 7
4.5
15.5 x 9.5
5


Marquise
Approx. Millimeter
Approx. Carat Weight
8 x 4
0.5
10.5 x 5.5
1
11.5 x 7
1.25
11.7 x 6
1.5
13 x 6.5
2
14 x 7
2.5
15 x 7.5
3
16 x 8
3.5
16.5 x 8.3
4
17.5 x 6.5
4.5
17.7 x 9
5


Asscher
Approx. Millimeter
Approx. Carat Weight
4.4
0.5
5.5
1
6
1.25
6.3
1.5
7
2
7.5
2.5
8
3
8.3
3.5
8.6
4
9
4.5
9.7
5


Heart
Approx. Millimeter
Approx. Carat Weight
5.5 x 5
0.5
7 x 6
1
7.6 x 6.5
1.25
8 x 7
1.5
9 x 8
2
9.5 x 8.5
2.5
10 x 9
3
10.5 x 9.5
3.5
11 x 10
4
11.5 x 7.5
4.5
12 x 10.5
5