Diamond Cut Size Chart

A diamond carat size chart shows the relationship between carat weight and diamond dimensions in millimeters (mm). It helps visualize diamond sizes and understand how cut affects appearance and brilliance.

Round MM Size	Round Carat Weight
4 mm	0.25 ct
5.0 mm	0.50 ct
5.75 mm	0.75 ct
6.5 mm	1.00 ct
6.8 mm	1.25 ct
7.3 mm	1.50 ct
7.75 m	1.75 ct
8 mm	2.00 ct
8.7 mm	2.50 ct
9.1 mm	3.00 ct
9.75 mm	3.50 ct
10.25 mm	4.00 ct
10.75 mm	4.50 ct
11 mm	5.00 ct

Round MM Size	Round Carat Weight
0.8 mm	0.0025 ct
1 mm	0.005 ct
1.1 mm	0.0067 ct
1.2 mm	0.009 ct
1.25 mm	0.01 ct
1.3 mm	0.01 ct
1.5 mm	0.015 ct
1.75 mm	0.02 ct
1.8 mm	0.025 ct
2 mm	0.03 ct
2.2 mm	0.04 ct
2.5 mm	0.06 ct
2.75 mm	0.08 ct
3 mm	0.10 ct
3.25 mm	0.14 ct
3.5 mm	0.17 ct
3.75 mm	0.21 ct
4 mm	0.25 ct
4.25 mm	0.28 ct
4.5 mm	0.36 ct
4.75 mm	0.44 ct
5.0 mm	0.50 ct
5.25 mm	0.56 ct
5.5 mm	0.66 ct
5.75 mm	0.75 ct
6 mm	0.84 ct
6.25 mm	0.93 ct
6.5 mm	1.00 ct
6.8 mm	1.25 ct

Round MM Size	Round Carat Weight
7 mm	1.30 ct
7.3 mm	1.50 ct
7.5 mm	1.67 ct
7.75 mm	1.75 ct
8 mm	2.00 ct
8.25 mm	2.11 ct
8.5 mm	2.43 ct
8.7 mm	2.50 ct
9 mm	2.75 ct
9.1 mm	3.00 ct
9.5 mm	3.35 ct
9.75 mm	3.50 ct
10 mm	3.87 ct
10.25 mm	4.00 ct
10.5 mm	4.41 ct
10.75 mm	4.50 ct
11 mm	5.00 ct
11.25 mm	5.49 ct
11.5 mm	5.85 ct
12 mm	6.84 ct
12.25 mm	7.26 ct
12.5 mm	7.36 ct
12.75 mm	7.52 ct
13 mm	8.51 ct
13.5 mm	9.53 ct
14 mm	10.49 ct
15 mm	12.89 ct
16 mm	16.06 ct

Diamond size charts by shape

Explore the comprehensive diamond size charts by shape to find the perfect fit for your jewelry designs

Round Diamond Size Chart

Princess Diamond Size Chart

Cushion Diamond Size Chart

Oval Diamond Size Chart

Emerald Diamond Size Chart

Pear Diamond Size Chart

Heart Diamond Size Chart

Marquise Diamond Size Chart

Asscher Diamond Size Chart

Radiant Diamond Size Chart

Cut Insight

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Size Chart GUIDES

Diamond Size Chart

Diamonds carat size chart in mm

No person can ever be able to tell precisely whether a particular diamond is larger or smaller without using a scale for measuring. So, precisely a 0.95-carat diamond will not have any major difference when compared to 1 carat diamond in terms of size.

Measurement of diamonds can be done using millimeters as well as carat weight. However, it is advisable to opt for the measurement of diamond in mm for loose diamonds and aimed at getting the best deal in an approximate budget.

Based on size

Generally, longer-shaped fancy diamonds tend to appear bigger and broader to the naked eye when compared to round or square-shaped diamonds of similar carat weight.

Based on length and width

The length into width measurements directly correspond to the shape of the diamond. It is a typical phenomenon for a well-cut diamond of a carat weight.

Based on the crown area

The crown area is the actual size of the diamond as how it would appear when viewed from the top. Visually a marquise shape would appear larger than a round shape in its top view.