Diamond Size

A diamond size chart is a valuable tool that provides information on the dimensions of diamonds in relation to their carat weight. It serves as a visual guide to help individuals understand how different carat weights translate into physical size variations.

Round Cut Diamond Size Chart (MM)

Wondering what a 1 carat round diamond looks link on a hand? Our round diamond size chart will help you convert millimetre (mm) size to carat size for round cut diamonds.
Round MM Size Round Carat Weight
4.0 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 mm. 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.

Princess Cut Diamond Size Chart (MM)

Want to know how big a 2 carat princess cut diamond looks on a hand? Our princess cut diamond size chart shows you the millimetre (mm) size for princess cut diamonds.
Princess MM Size Princess Carat Weight
3.25 mm. 0.25 ct.
4.5 mm. 0.50 ct.
5 mm. 0.75 ct.
5.5 mm. 1.00 ct.
6 mm. 1.25 ct.
6.5 mm. 1.50 ct.
6.75 mm. 1.75 ct.
7 mm. 2.00 ct.
7.5 mm. 2.50 ct.
8 mm. 3.00 ct.
8.5 mm. 3.50 ct.
8.75 mm. 4.00 ct.
9.25 mm. 4.50 ct.
9.5 mm. 5.00 ct.

Oval Cut Diamond Size Chart (MM)

The Oval cut diamond varies in length-to-width ratios like the Emerald cut diamond. The chart below compiles average conversions for the millimetre measurements and carat weight of Oval cut diamonds.

 

Oval MM SizeOval Carat Weight
5×3 mm.0.25 ct.
6×4 mm.0.50 ct.
7×5 mm.0.75 ct.
7.7×5.7 mm.1.00 ct.
8×6 mm.1.25 ct.
8.5×6.5 mm.1.50 ct.
9×6.5 mm.1.75 ct.
9×7 mm.2.00 ct.
10×8 mm.2.50 ct.
12×8 mm.3.00 ct.
12×8.5 mm.3.50 ct.
12.5×8.5 mm.4.00 ct.
12.75×8.5 mm.4.50 ct.
12×10 mm.5.00 ct.

 

Emerald Cut Diamond Size Chart (MM)

Our Emerald cut diamond size chart includes a variety of common ratios and the standard conversions between millimetre measurements and carat weight for emerald diamonds.

 

Emerald MM SizeEmerald Carat Weight
4.30×3 mm.0.25 ct.
6×4 mm.0.50 ct.
6.5×4.5 mm.0.75 ct.
7×5 mm.1.00 ct.
7.3×5.3 mm.1.25 ct.
7.5×5.5 mm.1.50 ct.
8×6 mm.1.75 ct.
8.5×6.5 mm.2.00 ct.
9×7 mm.2.50 ct.
9.3×7.5 mm.3.00 ct.
9.75×7.7 mm.3.50 ct.
10×8 mm.4.00 ct.
10.5×8.5 mm.4.50 ct.
11×9 mm.5.00 ct.

Pear Cut Diamond Size Chart (MM)

Pear Cut diamonds vary widely in terms of cut proportions and resulting carat weights. The pear cut diamond size chart below will help you predict the expected size conversions for these diamonds.
Pear MM Size Pear Carat Weight
5×3 mm. 0.25 ct.
6×4 mm. 0.50 ct.
7×5 mm. 0.75 ct.
7.7×5.7 mm. 1.00 ct.
8×6 mm. 1.25 ct.
8.5×6.5 mm. 1.50 ct.
10×6 mm. 1.75 ct.
9×7 mm. 2.00 ct.
10×8 mm. 2.50 ct.
12×8 mm. 3.00 ct.
12×9 mm. 3.50 ct.
14×8 mm. 4.00 ct.
14.5×9 mm. 4.50 ct.
15×9 mm. 5.00 ct.

Cushion Cut Diamond Size Chart (MM)

Cushion cut diamonds are one of the hardest shapes to predict size based on weight or millimetre measurements. Use our cushion diamond size chart to see how it would look on a hand.
Cushion MM Size Cushion Carat Weight
3.25 mm. 0.25 ct.
4.9 mm. 0.50 ct.
5.25 mm. 0.75 ct.
5.5 mm. 1.00 ct.
6 mm. 1.25 ct.
6.5 mm. 1.50 ct.
6.75 mm. 1.75 ct.
7 mm. 2.00 ct.
7.5 mm. 2.50 ct.
8 mm. 3.00 ct.
8.5 mm. 3.50 ct.
9 mm. 4.00 ct.
9.3 mm. 4.50 ct.
9.5 mm. 5.00 ct.

Heart Cut Diamond Size Chart (MM)

The ideal cut for a Heart shaped diamond is a square ratio of 1:1 for length and width. The chart below will help you convert the millimetre and carat weights for a heart cut diamond.
Heart MM Size Heart Carat Weight
4 mm. 0.25 ct.
5 mm. 0.50 ct.
6 mm. 0.75 ct.
6.5 mm. 1.00 ct.
7 mm. 1.25 ct.
7.5 mm. 1.50 ct.
7.7 mm. 1.75 ct.
8 mm. 2.00 ct.
8.5 mm. 2.50 ct.
9 mm. 3.00 ct.
10 mm. 3.50 ct.
10.5 mm. 4.00 ct.
11 mm. 4.50 ct.
11.5 mm. 5.00 ct.

Marquise Cut Diamond Size Chart (MM)

Marquise diamonds vary widely in terms of measurement proportions and carat weight. Use the chart below to obtain the average conversion expectations for a marquise cut diamond.
Marquise MM Size Marquise Carat Weight
6×3 mm. 0.25 ct.
8×4 mm. 0.50 ct.
9×4.5 mm. 0.75 ct.
10×5 mm. 1.00 ct.
11×5.5 mm. 1.25 ct.
12×6 mm. 1.50 ct.
12.5×6.25 mm. 1.75 ct.
13×6.5 mm. 2.00 ct.
14×7 mm. 2.50 ct.
15×7 mm. 3.00 ct.
15×8 mm. 3.50 ct.
16.5×8.25 mm. 4.00 ct.
16.75×8.5 mm. 4.50 ct.
17×8.5 mm. 5.00 ct.

Radiant Cut Diamond Size Chart (MM)

The ideal ratio for a Radiant cut diamond produces a slightly rectangular shape. The chart below gives you the weight and millimetre size conversions for the ideal radiant cut diamond.
Radiant MM Size Radiant Carat Weight
4.3×3 mm. 0.25 ct.
6×4 mm. 0.50 ct.
6.5×4.5 mm. 0.75 ct.
7×5 mm. 1.00 ct.
7.3×5.5 mm. 1.25 ct.
7.5×5.8 mm. 1.50 ct.
8×6 mm. 1.75 ct.
8.2×6.2 mm. 2.00 ct.
9×7 mm. 2.50 ct.
9.5×7.5 mm. 3.00 ct.
10×8 mm. 3.50 ct.
10.2×8.2 mm. 4.00 ct.
10.5×8.5 mm. 4.50 ct.
11×9 mm. 5.00 ct.

Asscher Cut Diamond Size Chart (MM)

Do you want to figure out what a 2 carat Asscher cut diamond would look like on your hand? Use our Asscher cut diamond size chart to convert mm to carat size.
Asscher MM Size Asscher Carat Weight
3.25 mm. 0.25 ct.
4.5 mm. 0.50 ct.
5 mm. 0.75 ct.
5.5 mm. 1.00 ct.
6 mm. 1.25 ct.
6.5 mm. 1.50 ct.
6.7 mm. 1.75 ct.
7 mm. 2.00 ct.
7.5 mm. 2.50 ct.
8 mm. 3.00 ct.
8.5 mm. 3.50 ct.
9 mm. 4.00 ct.
9.25 mm. 4.50 ct.
9.5 mm. 5.00 ct.