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Gemstone and Stone Glossary
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Gemstone and Stone Glossary
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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