Home / Diamond Carat Size Chart - MM to Carats

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
1.10	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

Diamond Size Chart

This diamond size chart will help you compare sizes for our man made diamond and diamond simulant stone selection, as well as our lab grown diamond options.. Here you can find the carat size and weight of all of our classic shapes.

Still don’t know how to tell the difference between diamond sizes? For further questions regarding our diamond carat size chart, our team of professional jewelers would be more than happy to help you pick out your dream lab diamond ring.

Know your stone choices when shopping for man made jewelry:

Understand the differences between man made diamonds and alternative stones to choose the perfect option for you engagement ring or fine diamond jewelry. At Diamond Nexus, all of our loose diamond simulants have the same sparkle and brilliance as mined diamonds, but are conflict-free, of perfect quality and a fraction of the cost. No matter what cut, size, shape, or weight you had in mind, we’re sure you’ll be able to find exactly what you’ve dreamed of through our online selection.

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Lab Grown Diamonds

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

Durable and highly refractive
Less susceptible to cracking and chipping
More fire and brilliance than a diamond

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So you bought a loose stone. Now what?

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Design a custom piece for your loose stone.
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Have your loose stone set into an existing design.

Choose from hundreds of styles on DiamondNexus.com
Or show a designer a ring style you like from elsewhere and we can create something very similar.

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Diamond Size Chart

Round Cut

Princess / Square Cut

Asscher Cut

Marquise Cut

Radiant Cut

Cushion Cut

Pear Cut

Oval Cut

Heart Cut

Trillion Cut

Emerald Cut

Triangle Cut

Baguette Tapered Cut

Baguette Straight Cut

Diamond Size Chart

Know your stone choices when shopping for man made jewelry:

The Nexus Diamond™ Alternative

Lab Grown Diamonds

Moissanite

So you bought a loose stone. Now what?

Forever Artisans

Fine Custom Jewelry Brought to Life

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