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CT Conversion Chart

Understand the weight of your gems.

CT Conversion Chart

Understanding the weight of gems in carats is essential for any investor or jewelry enthusiast. Carat weight is the standard unit of measurement used in the diamond and gemstone industry, and it directly affects the value and price of the stone. This is why having a carat conversion chart like the one provided by our team at Accurate Precious Metals is crucial in making informed decisions about your investments.

Not only does it help you determine the actual weight of your gems, but it also allows you to compare the weight and value of different stones with different cuts and sizes accurately. It is essential to note that different gemstones have different densities, which can affect their weight even if they are of the same size. With this in mind, it is important to have a reliable and accurate carat conversion chart to help you make the most informed decisions about your investments in the jewelry and diamond industry. Use our chart below to calculate how much your jewelry and diamonds weigh in carats so that you can get a better price for them.

How to Use the Conversion Chart

To use the chart, simply click on your cut below and the conversion chart to the right will adjust. Not sure which cut your diamond or jewel is? Reach out to our team today and we can help with identification.

Do you have questions about the different millimeter-to-carat conversions or how to use the chart? Get in touch with us at Accurate Precious Metals Refineries today and we will be happy to assist you.

CT Conversion Chart

Click on the the cut to view its millimeter to carat conversion chart

  • Round
  • Princess
  • Asscher
  • Marquise
  • Radiant
  • Cushion
  • Pear
  • Oval
  • Heart
  • Trillion
  • Emerald
  • Triangle
  • Baguette Tapered
  • Baguette Straight

 

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

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

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

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 2 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

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

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

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

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

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

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

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

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

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

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