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Guide to Diamond Sizes

Carat Points
Milimeter
Equivalent
1/200 1/2 1.0
1/150 2/3 1.1
1/125 0.8 1.2
1/100 1.0 1.3
1/80 11/4 1.4
1/64 11/2 1.5
1/50 2.0 1.7
1/40 21/2 1.8
1/32 3.0 1.9
1/25 4.0 2.2
1/20 5.0 2.4
1/16 6.0 2.6
1/14 7.0 2.7
1/12 8.0 2.8
1/11 9.0 2.9
1/10 10.0 3.0
1/9 11.0 3-1/8
1/8 12 3-1/4
3/16 18 3-5/8
1/5 20 3-3/4
1/4 25 4.0
1/3 33 4-1/2
3/8 38 4-3/4
1/2 50 5-1/8
5/8 65 5-1/2
3/4 75 6.0
1.0 100 6-1/2