MM to Carat Weight Conversion

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Nexus Diamond™ Alternatives

You’ve decided that you want to go with a lab created diamond simulant. Now it’s time to pick the shape, mm size, carat weight and more. Click on the the cut to view its millimeter to carat conversion chart.

Round

Princess

Asscher

Cushion

Oval

Radiant

Emerald

Pear

Heart

Marquise

Triangle

Trillion

Baguette

Tapered Baguette

Round Cut

Shop Round Cut

MM Size	Carat Weight
0.8	0.0025
1	0.005
1.12	0.0075
1.15	0.0067
1.25	0.01
1.3	0.01
1.5	0.015
1.75	0.02
1.8	0.025
2	0.03
2.25	0.04
2.5	0.06
2.75	0.08
3	0.11
3.25	0.14
3.5	0.17
3.75	0.21
4	0.25
4.25	0.28
4.5	0.36
4.75	0.44
5	0.46
5.25	0.56
5.5	0.66
5.75	0.76
6	0.84
6.25	0.93
6.5	1.03
6.75	1.24

MM Size	Carat Weight
7	1.28
7.25	1.49
7.5	1.67
7.75	1.75
8	2.04
8.25	2.11
8.5	2.43
8.75	2.55
9	2.75
9.25	3.05
9.5	3.35
9.75	3.61
10	3.87
10.25	4.16
10.5	4.41
10.75	4.57
11	4.91
11.25	5.49
11.5	5.85
12	6.84
12.25	7.26
12.5	7.36
12.75	7.52
13	8.51
13.5	9.53
14	10.49
15	12.89
16	16.06

Princess / Square Cut

Shop Princess Cut

MM Size	Carat Weight
1.5	0.015
1.75	0.03
2	0.06
2.25	0.08
2.5	0.1
2.75	0.13
3	0.18
3.25	0.26
3.5	0.29
3.75	0.31
4	0.39
4.25	0.44
4.5	0.56
4.75	0.64
5	0.71
5.25	0.75
5.5	0.99
5.75	1.11
6	1.24
6.25	1.39

MM Size	Carat Weight
6.5	1.59
6.75	1.75
7	1.96
7.25	2.01
7.5	2.4
7.75	2.74
8	3.01
8.25	3.24
8.5	3.67
8.75	4.1
9	4.12
9.5	5.09
9.75	5.36
10	5.62
10.25	5.76
10.5	5.99
11	7.44
11.5	9.44
12	9.52

Asscher Cut

Shop Asscher Cut

MM Size	Carat Weight
4	0.39
4.5	0.56
5	0.71
5.5	0.99
6	1.24
6.5	1.59
7	1.96
7.5	2.4

MM Size	Carat Weight
8	3.01
8.5	3.67
9	4.12
9.5	5.09
10	5.62
11	7.44
12	9.52
13	12.66

Marquise Cut

Shop Marquise Cut

MM Size	Carat Weight
3 x 1.5	0.025
3.5 x 1.75	0.065
3.5 x 2	0.07
3.75 x 1.75	0.11
4 x 2	0.1
4.25 x 2.25	0.12
5 x 2.5	0.14
5 x 3	0.2
5.5 x 2.75	0.16
5.5 x 3	0.18
6 x 3	0.25
6.5 x 3	0.23
7 x 3	0.3
7 x 3.5	.35
7 x 4	3.4
7.5 x 3.5	0.33
8 x 4	0.47
9 x 4.5	0.71

MM Size	Carat Weight
9 x 5	0.76
9.5 x 5	0.85
10 x 5	0.95
11 x 5.5	1.25
11.5 x 6	1.33
12 x 6	1.62
12 x 6.5	1.71
13 x 6.5	2.11
14 x 7	2.48
15 x 7.5	3.09
14 x 8	3
15 x 7	3.12
15 x 8	3.44
16 x 8	3.86
17 x 8.5	4.88
17.5 x 10	5.5
20 x 8	7.08
20 x 10	7.94
20 x 11	9.5

Radiant Cut

Shop Radiant Cut

MM Size	Carat Weight
4.5 x 3.5	0.34
5 x 3	0.31
6 x 3	0.41
6 x 4	.60
6.5 x 4.5	0.83
7 x 5	1.14
7.25 x 5.25	1.24
7.5 x 5.5	1.47
8 x 6	1.74
8.5 x 6.5	2.25
9 x 7	2.62
9.5 x 7.5	3.18
10 x 7	3.31

MM Size	Carat Weight
10 x 8	3.49
11 x 9	5.05
11.5 x 10	6.45
12 x 9	6.06
12 x 10	6.79
13 x 9	6.54
13 x 11	9.33
13.5 x 11.5	10.19
14 x 10	8.47
14 x 12	12.14
15 x 11	11.48
16 x 12	14.22

Cushion Cut

Shop Cushion Cut

MM Size	Carat Weight
4	0.25
4.5	0.36
5	0.46
5.25	0.56
5.5	0.66
5.75	0.76
6	0.84
6.25	0.93
6.5	1.03
6.75	1.24
7	1.28
7.5	1.67

MM Size	Carat Weight
8	2.04
8.5	2.43
9	2.75
9.5	3.35
10	3.87
10.5	4.41
11	4.91
11.5	5.85
12	6.84
13	8.51
14	10.49
15	12.89

Pear Cut

Shop Pear Cut

MM Size	Carat Weight
3 x 2	0.13
4 x 2.5	0.18
4 x 3	0.21
5 x 3	0.25
5 x 4	0.35
6 x 4	0.39
6.5 x 4.5	0.57
7 x 5	0.71
8 x 5	0.81
8.5 x 5.5	1.08
8 x 6	1.25
9 x 6	1.33
9 x 7	1.75
10 x 6	1.71
10 x 7	1.8
10 x 8	2.46
11 x 7.50	2.61
11 x 8	3
12 x 7	3.12

MM Size	Carat Weight
12 x 8	3
12 x 9	3.44
13 x 8	2.98
14 x 8	3.47
13 x 9	4.11
14 x 9	4.25
15 x 9	5.06
14 x 10	5.41
13 x 11	5.65
15 x 10	5.75
15 x 11	7.36
16 x 9	5.86
16 x 10	6.27
16 x 12	8.99
17 x 10	6.46
18 x 11	8.14
18 x 12	9.35
18 x 13	10.21

Oval Cut

Shop Oval Cut

MM Size	Carat Weight
4.5 x 3.5	0.21
5 x 3	0.21
5 x 4	0.35
5.5 x 3.5	0.33
6 x 4	0.43
6.5 x 4.5	0.65
6 x 5	0.61
7 x 5	0.76
7.5 x 5.5	0.98
8 x 6	1.21
8.5 x 6.5	1.46
9 x 6	1.41
9 x 7	1.86

MM Size	Carat Weight
10 x 8	2.54
10.5 x 8.5	2.88
11 x 9	3.85
12 x 8	2.99
12 x 10	5.05
14 x 10	5.81
13 x 11	6.05
14 x 12	8.21
15 x 12	8.76
16 x 12	9.32
16 x 14	11.88
18 x 13	12.86
20 x 15	14.96

Heart Cut

Shop Heart Cut

MM Size	Carat Weight
3.5	0.18
4	0.25
4.25	0.28
4.5	0.34
4.75	0.38
5	0.44
5.5	0.61
6	0.74
6.25	0.83
6.5	0.93
7	1.13
7.5	1.59

MM Size	Carat Weight
8	1.71
9	2.41
9.5	2.9
10	3.16
11	4.41
12	5.66
13	7.88
14	9.38
15	10.79
16	13.27
18	15.33

Trillion Cut

Shop Trillion Cut

MM Size	Carat Weight
3	0.12
3.5	0.16
3.75	0.19
4	0.23
4.25	0.27
4.5	0.31
4.75	0.37
5	0.42
5.25	0.49
5.5	0.55
5.75	0.64
6	0.7

MM Size	Carat Weight
6.25	0.75
6.5	0.91
6.75	0.98
7	1.1
7.5	1.21
8	1.75
9	2.35
11	3.66
12	4.9
13	6.42
15	9

Emerald Cut

Shop Emerald Cut

MM Size	Carat Weight
3 x 2	0.1
3.5 x 2	0.12
4 x 2	0.15
4 x 3	0.2
5 x 3	0.29
5.5 x 3.5	0.46
5.5 x 4	0.48
6 x 4	0.66
6.5 x 4.5	0.88
7 x 5	1.06
7.25 x 5.25	1.24
7.5 x 5.5	1.45
8 x 6	1.74
8.5 x 6.5	2.17

MM Size	Carat Weight
9 x 7	2.62
9.5 x 7.5	3.21
10 x 7	3.01
10 x 8	3.79
11 x 9	5.21
12 x 8	5.34
12 x 10	6
13 x 9	6.38
14 x 8	6.25
14 x 10	8.48
13 x 11	9.13
14 x 12	11.26
16 x 12	14.22

Triangle Cut

Shop Triangle Cut

MM Size	Carat Weight
2.5	0.08
3	0.12
3.5	0.18
4	0.25
4.25	0.32
4.5	0.37
4.75	0.42
5	0.45
5.25	0.53
5.5	0.66
5.75	0.71
6	0.76
6.25	0.86
6.5	0.94
6.75	1.02

MM Size	Carat Weight
7	1.11
7.25	1.32
7.5	1.45
7.75	1.69
8	1.79
8.25	1.86
9	2.15
9.25	2.54
9.75	3.25
10	3.52
11	4.74
12	6.03
13	8.12
14	9.83

Baguette Tapered Cut

Shop Baguette Tapered Cut

MM Size	Carat Weight
2 x 1.5 x 1	0.025
2.5 x 1.5 x 1	0.035
2.5 x 1.75 x 1	0.04
3 x 1.5 x 1	0.05
3 x 1.75 x 1.25	0.055
3 x 1.75 x 1.3	0.055
3 x 1.75 x 1.5	0.055
3 x 2 x 1	0.06
3 x 2 x 1.25	0.065
3 x 2 x 1.5	0.07
3 x 2 x 1.75	0.075
3 x 2.5 x 2	0.08
3.25 x 1.75 x 1	0.07
3.25 x 1.75 x 1.25	0.05
3.5 x 1.25 x 1	0.04
3.5 x 1.5 x 1	0.05
3.5 x 1.5 x 1.25	0.055
3.5 x 1.7 x 1.3	0.055
3.5 x 1.75 x 1	0.06
3.5 x 1.75 x 1.25	0.07
3.5 x 1.75 x 1.3	0.065
3.5 x 2 x 1.25	0.08
3.5 x 2 x 1.5	0.09
3.5 x 2.5 x 2	0.09
3.75 x 2 x 1.25	0.08
4 x 1.5 x 1	0.07
4 x 1.5 x 1.2	0.08
4 x 1.75 x 1.25	0.08
4 x 2 x 1.5	0.1
4 x 2.5 x 1.5	0.12
4 x 2.5 x 2	0.21
4 x 3 x 2	0.21
4.25 x 2 x 1.25	0.11

MM Size	Carat Weight
4.25 x 2 x 1.5	0.13
4.25 x 2.5 x 1.25	0.13
4.25 x 2.5 x 1.5	0.135
4.5 x 1.75 x 1.25	0.15
4.5 x 2 x 1.5	0.12
4.5 x 2.3 x 1.8	0.16
4.5 x 2.5 x 2	0.15
4.5 x 2.75 x 1.75	0.15
4.5 x 3 x 2	0.16
4.5 x 3 x 2.5	0.16
4.75 x 2.5 x 1.5	0.15
4.75 x 3 x 2	0.18
5 x 2 x 1	0.14
5 x 2 x 1.25	0.15
5 x 2 x 1.5	0.15
5 x 2.3 x 1.8	0.16
5 x 2.5 x 1.5	0.2
5 x 2.5 x 2	0.21
5 x 2.75 x 2	0.21
5 x 3 x 2	0.25
5 x 3.5 x 2	0.26
5 x 4 x 3.5	0.28
5.5 x 2 x 1.5	0.18
5.5 x 2.5 x 1.75	0.23
5.5 x 2.5 x 2	0.23
5.5 x 3 x 2	0.26
5.5 x 3 x 2.25	0.26
5.5 x 4 x 2.5	0.28
6 x 2 x 1.5	0.3
6 x 2.5 x 1.5	0.3
6 x 3 x 2	0.3
6.5 x 2.5 x 2	0.3
6.5 x 3 x 2	0.32

Baguette Straight Cut

Shop Baguette Straight Cut

MM Size	Carat Weight
2 x 1	0.02
2 x 1.5	0.04
2 x 1.75	0.04
2.25 x 1.75	0.04
2.25 x 2	0.045
2.5 x 1	0.045
2.5 x 1.25	0.047
2.5 x 1.5	0.05
2.5 x 1.75	0.055
2.5 x 2	0.055
2.75 x 1.5	0.055
2.75 x 1.75	0.06
2.75 x 2	0.06
2.75 x 2.5	0.065
3 x 1	0.05
3 x 1.25	0.055
3 x 1.5	0.06
3 x 1.75	0.08
3 x 2	0.1
3 x 2.5	0.13
3.25 x 1.25	0.06
3.25 x 1.5	0.065
3.25 x 1.75	0.08
3.25 x 2.5	0.14
3.5 x 1	0.065
3.5 x 1.25	0.07
3.5 x 1.5	0.07
3.5 x 1.75	0.08
3.5 x 2	0.13
3.5 x 2.5	0.15
3.5 x 3	0.15

MM Size	Carat Weight
3.75 x 1.5	0.14
3.75 x 2	0.145
4 x 1.25	0.075
4 x 1.5	0.08
4 x 1.75	0.11
4 x 2	0.14
4 x 3	0.2
4.5 x 1.5	0.1
4.5 x 1.75	0.14
4.5 x 2	0.17
4.5 x 2.5	0.2
4.5 x 3	0.285
4.5 x 3.5	0.3
4.75 x 1.5	0.27
4.75 x 2	0.28
5 x 1.5	0.14
5 x 1.75	0.15
5 x 2	0.19
5 x 2.5	0.24
5 x 3	0.3
5 x 3.5	0.33
5 x 4	0.4
5.5 x 1.75	0.16
5.5 x 2	0.18
5.5 x 2.5	0.23
5.5 x 3	0.3
5.5 x 3.5	0.33
6 x 1.75	0.28
6 x 2	0.3
6 x 2.5	0.33
6 x 3	0.4

12FIFTEEN

Lab Grown Diamonds

Carbon diamonds, grown in a lab.
Graded and certified by the International Gemological Institute (IGI).
Conflict free.

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MM to carat weight conversion values