Convert Carat to mm size chart      Gemstone Cut and Shape      Swarovski Crystal

 Round Cut

Millimeters    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              4.50                   450
11.0              4.75                   475
11.2              5.00                   500
12.0              6.50                   650

  Oval Cut

Millimeters           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               2.50                 250
10 x 8                   3.00                 300
10 x 8.5                3.50                 350
11 x 9                   4.00                 400
11 x 9.5                4.50                 450
12 x 10                 5.00                 500

  Princess Cut

Millimeters         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
Millimeters          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
Millimeters      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

Marquise
Millimeters      Carat        Weight Points
6 x3                0.41             41
6.5 x 3.5         0.53             53
7 x 3.5            0.60             35
8 x 3.5            0.69             69
8 x 4               0.80             80
9 x 4.5            1.20             120
10 x 5             1.62             162
11 x 5.5          2.12             212
12 x 6             2.75             275
13 x 6.5          3.60             360
14 x 7             4.22             422
15 x 7.5          5.25             525
16 x 8             6.57             657
17 x 8.5          8.30             830
18 x 9             9.61             961
20 x 10           13.49           1349
22 x 11           16.28           1628
30 x 15           36.50           3650