Diamond Engagement Rings 101: Solitaire Diamond Size Charts
Solitaire Diamond Size Charts.
So how big is a carat? Do all diamonds have the same millimeter size? Is there a difference in size between a round brilliant cut and a princess cut diamond? Let’s take a look at the measurements.
Round Brilliant Cut: (The following are approximate measurements for well cut stones. Stones that have lower cut grades may be smaller due to the stones being cut deeply or having thick girdles which keeps the rough weight).
Carat Size & Millimeter Size
0.03 carats 2.0 mm
0.05 carats 2.5 mm
0.07 carats 2.7 mm
0.10 carats 3.0 mm
0.15 carats 3.4 mm
0.20 carats 3.8 mm
0.25 carats 4.1 mm
0.33 carats 4.4 mm
0.40 carats 4.8 mm
0.50 carats 5.2 mm
0.65 carats 5.6 mm
0.75 carats 5.9 mm
0.85 carats 6.2 mm
1.00 carats 6.5 mm
1.25 carats 7.0 mm
1.50 carats 7.4 mm
1.75 carats 7.8 mm
2.00 carats 8.2 mm
2.25 carats 8.6 mm
2.50 carats 9.0 mm
3.00 carats 9.3 mm
4.00 carats 10.2 mm
5.00 carats 11.0 mm
6.00 carats 11.7 mm
7.00 carats 12.4 mm
8.00 carats 13.0 mm
10.00 carats 14.0 mm
15.00 carats 16.3 mm
20.00 carats 17.6 mm
Princess Cut Diamonds: ( The following are approximate measurements for well cut stones. Princess are fancy cuts. Therefore their measurements can greatly differ in length, width, and depth. Some stones may not be square, but instead elongated).
Princess Carat Size & Millimeter Size
Princess 0.50 carats 4.4 x 4.4 mm
Princess 1.00 carats 5.5 x 5.5 mm
Princess 1.50 carats 6.5 x 6.5 mm
Princess 2.00 carats 7.5 x 7.5 mm
Princess 2.50 carats 8.0 x 8.0 mm
Princess 3.00 carats 8.3 x 8.3 mm
Princess 4.00 carats 9.0 x 9.0 mm
Princess 5.00 carats 9.5 x 9.5 mm
Oval Cut Diamonds: ( The following are approximate measurements for well cut stones. Ovals are fancy cuts. Therefore their measurements can greatly differ in length, width, and depth).
Oval Carat Size & Millimeter Size
Oval 0.50 carats 6.0 x 4.0 mm
Oval 0.75 carats 7.0 x 5.0 mm
Oval 1.00 carats 7.5 x 5.5 mm
Oval 1.25 carats 8.0 x 6.0 mm
Oval 1.50 carats 8.5 x 6.5 mm
Oval 2.00 carats 9.5 x 7.5 mm
Oval 3.00 carats 10.0 x 8.0 mm
Oval 3.50 carats 10.5 x 8.5 mm
Oval 4.00 carats 11.0 x 9.0 mm
Oval 4.50 carats 11.5 x 9.5 mm
Oval 5.00 carats 12.0 x 10.0 mm
Pear Shape Diamonds: ( The following are approximate measurements for well cut stones. Pears are fancy cuts. Therefore their measurements can greatly differ in length, width, and depth).
Pear Carat Size & Millimeter Size
Pear 0.50 carats 6.0 x 4.0 mm
Pear 0.75 carats 7.0 x 5.0 mm
Pear 1.00 carats 8.0 x 5.5 mm
Pear 1.50 carats 9.0 x 6.0 mm
Pear 2.00 carats 10.0 x 6.5 mm
Pear 2.50 carats 11.0 x 7.0 mm
Pear 3.00 carats 12.0 x 8.0 mm
Pear 3.50 carats 13.0 x 8.5 mm
Pear 4.00 carats 14.0 x 9.0 mm
Pear 5.00 carats 15.0 x 9.5 mm
Marquise Shape Diamonds: ( The following are approximate measurements for well cut stones. Marquise are fancy cuts. Therefore their measurements can greatly differ in length, width, and depth).
Marquise Carat Size & Millimeter Size
Marquise 0.50 carats 8.0 x 4.0 mm
Marquise 0.75 carats 9.0 x 4.5 mm
Marquise 1.00 carats 10.0 x 4.75 mm
Marquise 1.50 carats 11.0 x 5.2 mm
Marquise 2.00 carats 12.0 x 6.0 mm
Marquise 2.50 carats 13.0 x 6.5 mm
Marquise 3.00 carats 14.0 x 7.0 mm
Marquise 4.00 carats 16.0 x 8.0 mm
Marquise 5.00 carats 17.0 x 9.0 mm
Marquise 10.00 carats 20.0 x 10.0 mm
Heart Shape Diamonds: ( The following are approximate measurements for well cut stones. Hearts are fancy cuts. Therefore their measurements can greatly differ in length, width, and depth).
Heart Carat Size & Millimeter Size
Heart 0.50 carats 5.0 x 5.0 mm
Heart 1.00 carats 6.5 x 6.5 mm
Hearts 1.50 carats 7.0 x 7.0 mm
Hearts 2.00 carats 8.0 x 8.0 mm
Hearts 2.50 carats 8.5 x 8.5 mm
Hearts 3.00 carats 9.0 x 9.0 mm
Hearts 4.00 carats 10.0 x 10.0 mm
Hearts 5.00 carats 11.0 x 11.0 mm
Emerald Shape Diamonds: ( The following are approximate measurements for well cut stones. Emeralds are fancy cuts. Therefore their measurements can greatly differ in length, width, and depth).
Emerald Carat Size & Millimeter Size
Emerald 0.50 carats 6.0 x 4.0 mm
Emerald 0.75 carats 6.5 x 4.5 mm
Emerald 1.00 carats 7.0 x 5.0 mm
Emerald 1.50 carats 8.0 x 6.0 mm
Emerald 2.00 carats 8.5 x 6.5 mm
Emerald 2.50 carats 9.0 x 7.0 mm
Emerald 3.00 carats 10.0 x 8.0 mm
Emerald 4.00 carats 11.0 x 9.0 mm
Emerald 5.00 carats 12.0 x 10.0 mm
Please remember that the above measurements are for well cut stones. Poorly cut stones that have very thick girdles and other problems can have a much smaller diameter size. Some fancy shape stones are cut very shallow. This can give them a huge face, but they may be lacking in luster and shine. Some flat stones can also look like glass because they are so thin.
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