Diamond Size Chart

Round Diamonds

This round diamond size chart or diamond weight chart lists ideal or near ideal sizes and carat weights. This means that if a diamond has an ideal cut it will have very specific dimensions which lend themselves towards this type of measurement. This is a jewelry industry standard. If a diamond has a cut which is further from ideal then the dimensions will be off, however, using this tool will still provide a rough estimation of size to carat weight.

Millimeter Size Carat Weight Carat Weight Fraction
1.0 mm 0.005 ct 1/200 ct
1.12 mm 0.0067 ct 67/10000
1.15 mm 0.0075 ct 3/400
1.3 mm 0.01 ct 1/100
1.5 mm 0.015 ct 3/200 ct
1.7 mm 0.02 ct 1/50 ct
1.8 mm 0.025 ct 1/40 ct
2.0 mm 0.03 ct 3/100 ct
2.5 mm 0.05 ct 5/100 ct
2.7 mm 0.07 ct 7/100 ct
3.0 mm 0.10 ct 1/10 ct
3.4 mm 0.15 ct 3/20 ct
3.8 mm 0.20 ct 1/5 ct
4.1 mm 0.25 ct 1/4 ct
4.4 mm 0.33 ct 33/100 ct
4.8 mm 0.40 ct 4/10 ct
5.2 mm 0.50 ct 1/2 ct
5.6 mm 0.65 ct 13/20 ct
5.9 mm 0.75 ct 3/4 ct
6.2 mm 0.85 ct 17/20 ct
6.5 mm 1.00 ct 1/1 ct
7.0 mm 1.25 ct 5/4 ct1
7.4 mm 1.50 ct 3/2 ct1
7.8 mm 1.75 ct 7/4 ct1
8.2 mm 2.00 ct 2/1 ct1
8.6 mm 2.25 ct 9/4 ct1
9.0 mm 2.50 ct 5/2 ct1
9.3 mm 3.00 ct 3/1 ct1
10.2 mm 4.00 ct 4/1 ct1
11.00 mm 5.00 ct 5/1 ct1
11.7 mm 6.00 ct 6/1 ct1
12.4 mm 7.00 ct 7/1 ct1
13.0 mm 8.00 ct 8/1 ct1

1 Carat Weight Fractions for diamonds larger than one carat are represented as an improper fraction.

Oval Diamonds

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