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January 28th 2022

Oval Cut Diamond Size Chart

By Devin Jones

Oval cut diamonds of the same carat weight can vary significantly in terms of visual appearance based on their length and width. Below is our diamond size chart showing the relationship between carat size, diameter, and surface area for oval cut diamonds.

Round Diamond Size Chart Round
Cushion Diamond Size Chart Cushion
Emerald Diamond Size Chart Emerald
Oval Diamond Size Chart Oval
Princess Diamond Size Chart Princess
Pear Diamond Size Chart Pear
Radiant Diamond Size Chart Radiant
Asscher Diamond Size Chart Asscher
Heart Diamond Size Chart Heart
Marquise Diamond Size Chart Marquise

Oval Cut Diamond Carat Size Chart

Oval Carat Weight Oval MM Size Surface Area (sq. mm)
0.3 ct. 4.49 15.86
0.4 ct. 4.94 19.15
0.5 ct. 5.31 22.16
0.6 ct. 5.64 24.96
0.7 ct. 5.93 27.61
0.8 ct. 6.19 30.13
0.9 ct. 6.44 32.54
1 ct. 6.66 34.87
1.1 ct. 6.87 37.11
1.2 ct. 7.07 39.28
1.3 ct. 7.26 41.39
1.4 ct. 7.44 43.45
1.5 ct. 7.61 45.45
1.6 ct. 7.77 47.41
1.7 ct. 7.93 49.33
1.8 ct. 8.07 51.21
1.9 ct. 8.22 53.05
2 ct. 8.36 54.86
2.1 ct. 8.49 56.64
2.2 ct. 8.62 58.39
2.3 ct. 8.75 60.11
2.4 ct. 8.87 61.81
2.5 ct. 8.99 63.48
2.6 ct. 9.11 65.13
2.7 ct. 9.22 66.76
2.8 ct. 9.33 68.36
2.9 ct. 9.44 69.95
3 ct. 9.54 71.52
3.1 ct. 9.65 73.07
3.2 ct. 9.75 74.60
3.3 ct. 9.84 76.12
3.4 ct. 9.94 77.62
3.5 ct. 10.04 79.11
3.6 ct. 10.13 80.58
3.7 ct. 10.22 82.03
3.8 ct. 10.31 83.48
3.9 ct. 10.40 84.91
4 ct. 10.48 86.33
4.1 ct. 10.57 87.73
4.2 ct. 10.65 89.12
4.3 ct. 10.73 90.51
4.4 ct. 10.82 91.88
4.5 ct. 10.90 93.24
4.6 ct. 10.97 94.59
4.7 ct. 11.05 95.93
4.8 ct. 11.13 97.26
4.9 ct. 11.20 98.58
5 ct. 11.28 99.89

Oval Diamond Carat Weight vs. Surface Area Chart

The below diamond size chart shows the changing dynamic between an increase in carat size and the respective increase in an oval cut diamond's visual appearance. While carat weight is typically thought of as an indication of a diamond's size (meaning visual appearance), carat is actually a measure of weight. Diamonds of the same carat size can vary slightly in their visual appearance depending on how they are cut. For instance, a diamond with a deeper cut will appear smaller than a diamond of the same carat weight with a shallower cut.

For our oval cut diamond analysis we averaged the diameters of hundreds of thousands of diamonds to come up with a simple exponential function (shown on the chart below). Using this formula we can study the corresponding changes in diameter and surface area for a given change in carat weight. Interestingly, as the carat size increases we notice a significant slowing of the surface area. This is because carat weight scales as a measure of volume (mm cube) while surface area scales at a slower rate (mm squared).

oval cut diamond size chart

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