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

Stay tuned!


Feedback

Send your feedback to us, with any comments, questions, recommendations, or such for this tool.