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Millimeter (mm) to Carat (ct) Gemstone Conversion Chart
Carat Size
Round/Square Brilliant/Princess
Pear
Marquise
Oval
Emerald
Heart
Trillion
0.25
4.1
6 x 3
5 x 3
4 x 4
4.5 x 4.5 x 4.5
0.50
5.2
6 x 4
8 x 4
5 x 5
6 x 6 x 6
0.75
5.8
7 x 5
9 x 4.5
6.5 x 4.5
6 x 6
1.00
6.5
8 x 5
10 x 5
6.5 x 6.5
1.25
7.0
7.5 x 5.5
1.50
7.4
9 x 6
11 x 5.5
8 x 6
7 x 7
7 x 7 x 7
2.00
8.2
10 x 7
12 x 6
8.5 x 6.5
8 x 8
8 x 8 x 8
2.50
8.8
12 x 7
13 x 6.5
9 x 7
8.5 x 8.5
9 x 9 x 9
3.00
9.4
12 x 8
14 x 7
10 x 8
9 x 9
10 x 10 x 10
3.50
10.0
13 x 8
14 x 7.5
10 x 8.5
9.5 x 9.5
4.00
10.04
14 x 8
16 x 8
11 x 9
10 x 10
4.50
10.80
14.5 x 9
11 x 9.5
10.5 x 10.5
5.00
11.20
15 x 9
16 x 8.5
12 x 10
11 x 11
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