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Diamond Size Guide

Diamond Carat to mm size chart

Round Cut
Milimeters Carat weight Points
1.0 0.005 0.5
1.3 0.01 1
1.5 0.015 1.5
1.7 0.02 1
1.8 0.025 2.5
2.0 0.03 3
2.1 0.035 3.5
2.2 0.04 4
2.4 0.05 5
2.5 0.06 6
2.7 0.07 7
2.8 0.08 8
2.9 0.09 9
3.0 0.10 10
3.1 0.11 11
3.2 0.12 12
3.3 0.14 14
3.4 0.15 15
3.5 0.16 16
3.6 0.17 17
3.7 0.18 18
3.8 0.20 20
3.9 0.22 22
4.0 0.25 25
4.2 0.30 30
4.4 0.33 33
4.5 0.35 35
4.6 0.38 38
4.8 0.40 40
5.0 0.50 50
5.4 0.60 60
5.5 0.63 63
5.6 0.65 65
6.0 0.75 75
6.4 0.95 95
6.6 1.00 100
6.8 1.17 117
7.0 1.25 125
7.2 1.33 133
7.5 1.55 155
7.8 1.75 175
8.0 2.00 200
8.4 2.15 215
8.6 2.25 225
9.0 2.75 275
9.4 3.00 300
9.6 3.15 315
9.8 3.35 335
10.0 3.50 350
10.2 3.75 375
10.4 4.00 400
10.6 4.25 425
10.8 4.5 450
11.0 4.75 475
11.2 5.00 500
12.0 6.50 650


Oval Cut
Milimeters Carat weight Points
4 x 3 0.20 20
5 x 3 0.25 25
5 x 3.5 0.33 33
5 x 4 0.40 40
6 x 4 0.50 50
6.5 x 4.5 0.65 65
7 x 5 0.75 75
7.5 x 5.5 1.00 100
8 x 6 1.25 125
8.5 x 6.5 1.50 150
9 x 6 1.75 175
9 x 7 2.00 200
9.5 x 7.5 2.5 250
10 x 8 3.00 300
10 x 8.5 3.5 350
11 x 9 4.00 400
11 x 9.5 4.50 450
12 x 10 5.00 500


Marquise Cut
Milimeters Carat weight Points
3.5 x 1.5 0.07 7
4 x 2 0.10 10
5 x 2 0.20 20
5 x 3 0.22 22
5.5 x 2.5 0.25 25
6 x 6 0.30 30
7 x 3 0.35 35
7 x 3.5 0.38 38
7 x 4 0.40 40
8 x 4 0.50 50
8.5 x 4.5 0.65 65
9 x 4 .70 70
9 x 4.5 0.75 75
9 x 5 0.80 80
9.5 x 4.5 0.85 85
10 x 4.75 1.00 100
10 x 5 1.25 125
11 x 5 1.50 150
11 x 5.5 1.65 165
12 x 6 2.00 200
13 x 5.5 2.50 250
13 x 6 2.65 265
14 x 6.5 2.87 287
14 x 7 3.00 300
15 x 7 3.75 375
16 x 8 4.50 450
18 x 9 7.00 700
20 x 10 10 1000


Princess Cut
Milimeters Carat weight Points
2.00 0.06 6
2.25 0.08 8
2.50 0.10 10
2.75 0.13 13
3.0 0.15 15
3.25 0.20 20
3.5 0.23 23
3.75 0.25 25
4.0 0.30 30
4.42 0.35 35
4.5 0.40 40
4.75 0.50 50
5.0 0.63 63
5.25 0.75 75
5.5 1.00 100
6.0 1.25 125
7.0 1.60 160
8.0 2.25 225


Emerald Cut
Milimeters Carat weight Points
4 x 3 0.20 20
5 x 3 0.25 25
6 x4 0.50 50
6.5 x 4.5 0.75 75
7 x 5 1.00 100
8 x 6 1.50 150
8.5 x 6.5 2.00 200
9 x 7 2.50 250
10 x 8 3.00 300
11 x 9 4.00 400
12 x 10 5.00 500


Pear Cut
Milimeters Carat weight Points
4 x 2 0.20 20
5 x 3 0.30 30
6 x 4 0.50 50
7 x 5 0.75 75
8 x 5 1.00 100
9 x 6 1.50 150
10 x 7 2.00 200
12 x 7 2.50 250
12 x 8 3.00 300
13 x 8 3.50 350
14 x 8 4.00 400
15 x 9 5.00 500



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