Diamond Sizes in MM

If you know your ring size but you have a different number than the size we use in Belgium (ISO 8653:2016 which defiWondering what a 1 carat round diamond looks link on a hand? Our round diamond size chart will help you convert millimeter (mm) size to carat size for round cut diamonds.nes the number in terms of internal circumfrence) use the table below to convert your size. We also recommend cross referencing your ring size by measuring the ring internal diameter and/or internal circumference.

Diamond Sizes in MM

ROUND MM SIZE	ROUND CARAT WEIGHT	BLACK DIAMONDS CT. WEIGHT
0.8 mm.	0.0025 ct.	0.00
1 mm.	0.005 ct.	0.01
1.1 mm.	0.0067 ct.	0.01
1.2 mm.	0.009 ct.	0.01
1.25 mm.	0.01 ct.	0.01
1.3 mm.	0.01 ct.	0.01
1.5 mm.	0.015 ct.	0.02
1.75 mm.	0.02 ct.	0.02
1.8 mm.	0.025 ct.	0.03
2 mm.	0.03 ct.	0.04
2.2 mm.	0.04 ct.	0.05
2.5 mm.	0.06 ct.	0.07
2.75 mm	0.08 ct.	0.10
3 mm.	0.10 ct.	0.12
3.25 mm.	0.14 ct.	0.17
3.5 mm.	0.17 ct.	0.20
3.75 mm.	0.21 ct.	0.25
4 mm	0.25 ct.	0.33
4.25 mm.	0.28 ct.	0.36
4.5 mm.	0.36 ct.	0.47
4.75 mm.	0.44 ct.	0.57
5.0 mm.	0.50 ct.	0.65
5.25 mm.	0.56 ct.	0.73
5.5 mm.	0.66 ct.	0.89
5.75 mm.	0.75 ct.	1.01
6 mm.	0.84 ct.	1.20
6.25 mm.	0.93 ct.	1.30
6.5 mm.	1.00 ct	1.40
6.8 mm.	1.25 ct.	1.80
7 mm.	1.30 ct.	1.90
7.3 mm.	1.50 ct.	2.10
7.5 mm.	1.67 ct.	2.40
7.75 mm.	1.75 ct.	2.50
8 mm.	2.00 ct.	2.80
8.25 mm.	2.11 ct.	3.00
8.5 mm.	2.43 ct.	3.50
8.7 mm.	2.50 ct.	3.50
9 mm.	2.75 ct.	3.90
9.1 mm.	3.00 ct.	4.20
9.5 mm.	3.35 ct.	4.70
9.75 mm.	3.61 ct.	5.10
10 mm.	3.87 ct.	5.50
10.25 mm.	4.16 ct.	5.50
10.5 mm.	4.41 ct.	5.80
10.75 mm.	4.57 ct.	6.00
11 mm.	4.91 ct.	6.40
11.25 mm.	5.49 ct.	7.20
11.5 mm.	5.85 ct.	7.70
12 mm.	6.84 ct.	8.90
12.25 mm.	7.26 ct.	9.50
12.5 mm.	7.36 ct.	9.60
12.75 mm.	7.52 ct.	9.80
13 mm.	8.51 ct.	11.10
13.5 mm.	9.53 ct.	12.40
14 mm.	10.49 ct.	13.70
15 mm.	12.89 ct.	16.80
16 mm.	16.06 ct.	20.90

Princess Diamond Sizes

Princess MM Size	Princess Weight (ct)
1.5 mm.	0.02
1.75 mm.	0.03
2 mm.	0.06
2.25 mm.	0.08
2.5 mm.	0.10
2.75 mm.	0.13
3 mm.	0.18
3.25 mm.	0.26
3.5 mm.	0.29
3.75 mm.	0.31
4 mm.	0.39
4.25 mm.	0.44
4.5 mm.	0.50
4.75 mm.	0.64
5 mm.	0.75
5.25 mm.	0.90
5.5 mm.	1.00
5.75 mm.	1.11
6 mm.	1.25
6.25 mm.	1.39
6.5 mm.	1.50
6.75 mm.	1.75
7 mm.	2.00
7.25 mm.	2.01
7.5 mm.	2.50
7.75 mm.	2.74
8 mm.	3.00
8.25 mm.	3.24
8.5 mm.	3.67
8.75 mm.	4.10
9 mm.	4.12
9.5 mm.	5.09
9.75 mm.	5.36
10 mm.	5.62
10.25 mm.	5.76
10.5 mm.	5.99
11 mm.	7.44
11.5 mm.	9.44
12 mm.	9.52

Cushion Diamond Sizes

Cushion MM Size	Cushion Weight (ct)
4.2 mm.	0.40
4.9 mm.	0.50
5.25 mm.	0.75
5.5 mm.	1.00
6 mm.	1.25
6.5 mm.	1.50
7 mm.	2.00
7.5 mm.	2.50
8 mm.	3.00
8.5 mm.	3.50
9 mm.	4.12
9.5 mm.	5.09
10 mm.	5.62
11 mm.	7.44
12 mm.	9.52
13 mm.	12.66

Oval Diamond Sizes

Oval MM Size	Oval Weight (ct)
4.5×3.5 mm.	0.25
5×3 mm.	0.25
5.5×3.5 mm.	0.40
5×4 mm.	0.42
6×4 mm.	0.65
6×5 mm.	0.79
6.5×4.5 mm.	0.85
7×5 mm.	1.00
7.7×5.7 mm.	1.40
8×6 mm.	1.80
9×6 mm.	2.00
8.5×6.5 mm.	2.10
9×7 mm.	2.80
10×8 mm.	3.50
10.5×8.5 mm.	4.10
12×8 mm.	4.20
11×9 mm.	5.40
12×10 mm.	7.10
14×10 mm.	8.20
13×11 mm.	8.50
14×12 mm.	11.50
15×12 mm.	12.30
16×12 mm.	13.10
16×14 mm.	16.70
18×13 mm.	18.10
20×15 mm.	21.00

Emerald Diamond Sizes

Emerald MM Size	Emerald Weight (ct)
3×2 mm.	0.10
3.5×2 mm.	0.12
4×2 mm.	0.15
4×3 mm.	0.20
5×3 mm.	0.29
5.5×3.5 mm.	0.46
6×4 mm.	0.50
6.5×4.5 mm.	0.75
6.7×4.5 mm.	0.88
7×5 mm.	1.00
7.3×5.3 mm.	1.25
7.5×5.5 mm.	1.50
8×6 mm.	1.75
8.5×6.5 mm.	2.00
9×7 mm.	2.50
10×7.5 mm.	3.00
9.5×7.5 mm.	3.21
10×8 mm.	3.79
11×9 mm.	5.21
12×8 mm.	5.34
12×10 mm.	6.00
14×8 mm.	6.25
13×9 mm.	6.38
14×10 mm.	8.48
13×11 mm.	9.13
14×12 mm.	11.26
16×12 mm.	14.22

Heart Diamond Sizes

Heart MM Size	Heart Weight (ct)
3.5 mm.	0.18
4 mm.	0.25
4.25 mm.	0.28
4.5 mm.	0.34
4.75 mm.	0.38
5 mm.	0.50
5.5 mm.	0.61
6 mm.	0.75
6.25 mm.	0.83
6.5 mm.	1.00
7 mm.	1.25
7.5 mm.	1.50
8 mm.	2.00
8.5 mm.	2.50
9 mm.	3.00
10 mm.	3.50
11 mm.	4.41
12 mm.	5.66
13 mm.	7.88
14 mm.	9.38
15 mm.	10.79
16 mm.	13.27
18 mm.	15.33

Pear Diamond Sizes

Pear MM Size	Pear Weight (ct)
3×2 mm.	0.13
4×2.5 mm.	0.18
4×3 mm.	0.21
5×3 mm.	0.25
5×4 mm.	0.35
6×4 mm.	0.50
6.5×4.5 mm.	0.60
7×5 mm.	0.75
7.5×5.5 mm.	0.85
7.7×5.7 mm.	1.00
8.5×6.5 mm.	1.50
8.7×6.7 mm.	1.80
9×7 mm.	2.00
11×7.50 mm.	2.61
13×8 mm.	2.98
11×8 mm.	3.00
12×8 mm.	3.00
12×7 mm.	3.12
12×9 mm.	3.44
14×8 mm.	3.47
13×9 mm.	4.11
14×9 mm.	4.25
15×9 mm.	5.06
14×10 mm.	5.41
13×11 mm.	5.65
15×10 mm.	5.75
16×9 mm.	5.86
16×10 mm.	6.27
17×10 mm.	6.46
15×11 mm.	7.36
18×11 mm.	8.14
16×12 mm.	8.99
18×12 mm.	9.35
18×13 mm.	10.21

Marquise Diamond Sizes

Marquise MM Size	Marquise Weight (ct)
3×1.5 mm.	0.03
3.5×1.75 mm.	0.07
3.5×2 mm.	0.07
4×2 mm.	0.10
3.75×1.75 mm.	0.11
4.25×2.25 mm.	0.12
5×2.5 mm.	0.14
5.5×2.75 mm.	0.16
5.5×3 mm.	0.18
5×3 mm.	0.20
6.5×3 mm.	0.23
6×3 mm.	0.25
7×3 mm.	0.30
7.5×3.5 mm.	0.33
7×4 mm.	0.34
8×4 mm.	0.50
8.75×4.25 mm.	0.70
9×4.5 mm.	0.75
9.5×4.7 mm.	0.85
10×5 mm.	1.00
11×5.5 mm.	1.25
11.5×6 mm.	1.33
12×6 mm.	1.50
13×6.5 mm.	2.00
14×7 mm.	2.50
15×7 mm.	3.00
14×8 mm.	3.00
15×7.5 mm.	3.25
15×8 mm.	3.44
16×8 mm.	3.86
16×8 mm.	3.86
16.5×8.25 mm.	4.00
17×8.5 mm.	4.88
17.5×10 mm.	5.50
20×8 mm.	7.08
20×10 mm.	7.94
20×11 mm.	9.50

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