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Beading Resources > EncycloBEADia > Faceted Gemstone Weight and Size Charts

 Faceted Gemstone Weight and Size Charts 


Faceted gemstones are measured in a number of ways, the most common measurement is carat weight. The international standard of the metric carat was adopted in the United States by 1920 and this is the current standard for weighing gemstones. One metric carat = 0.2 gram (or 200 milligrams).

You'll find estimated weights for different sizes of faceted gemstones in the following chart. Different gemstone materials have different weights, just like steel and brick have different weights. For example a carat of a light material such as opal will be larger than a carat of a more dense stone such as peridot or topaz.

Round (rd)
 
Size / mm
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8
10
0.01
0.02
0.04
0.07
0.1
0.14
0.2
0.28
0.4
0.52
0.7
0.91
1.3
1.5
1.8
3.3
0.01
0.02
0.04
0.06
0.1
0.16
0.25
0.33
0.45
0.57
0.75
1.09
1.6
1.92
2.2
3.5
Citrine - CT
0.01
0.02
0.04
0.07
0.1
0.14
0.2
0.28
0.4
0.52
0.7
0.91
1.3
1.5
1.8
3.3
0.01
0.03
0.05
0.09
0.18
0.28
0.45
0.63
0.9
1.08
1.44
1.8
2.25
2.7
3.6
7.2
 
Diamond - CT
0.01
0.02
0.03
0.05
0.1
0.16
0.25
0.35
0.5
0.6
0.8
1
1.25
1.5
2
4
0.01
0.02
0.04
0.08
0.12
0.2
0.27
0.38
0.48
0.65
0.8
1.16
1.55
1.85
2.2
4.25
Garnet - CT
0.01
0.03
0.05
0.08
0.13
0.2
0.3
0.42
0.6
0.76
1
1.24
1.6
1.96
2.5
5.75
 
Opal - CT
0.01
0.01
0.02
0.05
0.09
0.12
0.16
0.23
0.34
0.43
0.57
0.67
0.83
1.02
1.3
2
Peridot - CT
0.01
0.02
0.05
0.77
0.12
0.18
0.26
0.36
0.5
0.62
0.85
1.01
1.25
1.55
2
5.25
Ruby - CT
0.01
0.03
0.05
0.09
0.15
0.24
0.34
0.45
0.6
0.82
1.05
1.3
1.7
2
2.3
4.75
0.01
0.03
0.05
0.09
0.15
0.24
0.34
0.45
0.6
0.82
1.05
1.3
1.7
2
2.3
4.75
Topaz - CT
0.01
0.02
0.04
0.07
0.11
0.19
0.3
0.41
0.56
0.73
1
1.22
1.55
1.93
2.5
5.75
0.01
0.02
0.04
0.08
0.12
0.17
0.24
0.32
0.45
0.57
0.75
1.01
1.25
1.55
2
3.2
Oval (ov)
 
Size / mm
5x3
6x4
7x5
8x6
9x7
10x8
11x9
12x10
0.23
0.45
0.85
1.25
1.75
2.4
3.2
4.5
0.2
0.4
0.75
1.1
1.75
2.25
3
4.5
Citrine - CT
0.23
0.45
0.85
1.25
1.75
2.4
3.2
4.5
0.45
0.9
1.26
2.35
3.6
5.4
7.2
9
 
Diamond - CT
0.25
0.5
0.75
1.4
2
3
4
5
0.28
0.52
0.85
1
1.6
2.25
3.75
5
Garnet - CT
0.25
0.55
1
1.4
2.1
2.8
3.75
5
 
Opal - CT
0.16
0.28
0.47
0.78
1.1
1.65
2.15
3
Peridot - CT
0.28
0.5
0.95
1.35
2
2.25
3.5
4
Ruby - CT
0.35
0.6
1
1.55
2.2
3.15
3.8
6
0.35
0.6
1
1.55
2.2
3.15
3.8
6
Topaz - CT
0.27
0.57
1.1
1.6
2.5
3.5
4.5
6
 
Tourmaline - CT
0.25
0.5
0.9
1.18
2.3
2.9
3.5
5.25
Emerald Cut (ec)
 
Size / mm
5x3
6x4
7x5
8x6
9x7
10x8
11x9
12x10
0.35
0.55
1
1.6
2.25
2.9
4.2
5.6
0.25
0.5
0.8
1.4
2
3
4.3
4.75
Citrine - CT
0.35
0.55
1
1.6
2.25
2.9
4.2
5.6
0.45
0.9
1.8
2.7
4.5
5.85
9
12.6
 
Diamond - CT
0.25
0.5
1
1.5
2.5
3.25
5
7
0.3
0.6
0.9
1.8
2.31
3.15
4.5
5.25
Garnet - CT
0.4
0.8
1.2
1.7
2.5
3.5
4.3
6.35
Peridot - CT
0.35
0.6
1
1.7
2.25
3.8
5.25
6.25
 
Ruby - CT
0.55
0.7
1.15
1.7
2.3
3.4
4
6.25
 
Sapphire - CT
0.55
0.7
1.15
1.7
2.3
3.4
4
6.25
Topaz - CT
0.4
0.65
1.25
2.4
3.4
4
5.75
8
 
Tourmaline - CT
0.3
0.6
1.6
2.15
2.8
3.6
4.3
5.2
Pear Shape (ps)
 
Size / mm
5x3
6x4
7x5
8x5
9x6
10x7
0.2
0.35
0.65
0.85
1.2
1.7
Aquamarine - CT
0.2
0.35
0.65
0.9
1.3
1.85
Citrine - CT
0.2
0.35
0.65
0.85
1.2
1.7
0.45
0.9
1.26
1.53
1.89
3.6
 
Diamond - CT
0.25
0.5
0.7
0.85
1.05
2
0.25
0.45
0.7
1.05
1.7
2.6
Garnet - CT
0.25
0.4
1
1.15
1.3
1.8
 
Opal - CT
0.13
0.22
0.35
0.5
0.7
1.03
Peridot - CT
0.25
0.45
0.7
0.8
1.1
1.4
Ruby - CT
0.3
0.5
0.85
1.05
1.85
2.5
0.3
0.5
0.85
1.05
1.85
2.5
Topaz - CT
0.25
0.5
1
1.1
2
1.4
 
Tourmaline - CT
0.35
0.45
0.6
0.9
1.1
1.4
Marquise (mq)
 
Size / mm
4x2
6x3
8x4
10x5
12x6
0.1
0.2
0.48
0.9
1.59
0.08
0.2
0.5
0.8
1.5
Citrine - CT
0.1
0.2
0.48
0.9
1.59
0.18
0.45
0.9
1.8
2.7
 
Diamond - CT
0.1
0.25
0.5
1
1.5
0.09
0.3
0.6
1.1
1.8
Garnet - CT
0.09
0.25
0.6
1.2
2
 
Opal - CT
0.09
0.17
0.37
0.59
1
Peridot - CT
0.1
0.25
0.5
1
2
Ruby - CT
0.13
0.35
0.75
1.15
2.2
0.13
0.35
0.75
1.15
2.2
Topaz - CT
0.07
0.3
0.7
1.2
2
 
Tourmaline - CT
0.1
0.3
0.6
0.85
1.55
Square (sq)
 
Size / mm
1.5
2
2.5
3
3.5
4
4.5
5
Amethyst - CT
...
...
...
0.1
0.15
0.23
0.3
0.4
Aquamarine - CT
...
...
...
0.11
0.18
0.25
0.34
0.45
Citrine - CT
...
...
...
0.1
0.15
0.23
0.3
0.4
Cubic Zirconia - CT
0.04
0.09
0.16
0.27
0.39
0.58
0.7
0.9
Diamond - CT
0.02
0.05
0.09
0.15
0.22
0.32
0.39
0.5
Emeralds - CT
0.03
0.07
0.11
0.18
0.25
0.35
0.41
0.5
Garnet - CT
...
...
...
0.15
0.27
0.4
0.54
0.75
Peridot - CT
...
...
...
0.14
0.22
0.34
0.46
0.65
Ruby - CT
0.04
0.07
0.13
0.2
0.3
0.4
0.47
0.55
Sapphire - CT
0.04
0.07
0.13
0.2
0.3
0.4
0.47
0.55
Topaz - CT
...
...
...
0.12
0.24
0.35
0.51
0.7
Tourmaline - CT
...
...
...
0.13
0.2
0.33
0.41
0.55


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