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January 28th 2022

Cushion Cut Diamond Size Chart

By Devin Jones

Diamond shoppers often think of carat weight as a measurement of diamond size, or how big the diamond will look in an engagement ring setting. In reality, carat is a measurement of weight, not width or length. Two diamonds that weight the same amount can look very different when viewed from above, just like two people who weigh the same might look different depending on their height or waist size.

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

Cushion Cut Diamond Carat Size Chart

Cushion cut diamonds are either square or rectangular shaped diamonds and feature rounded corners. These rounded corners make the diamond resemble a pillow or cushion, hence the name "cushion cut".

To calculate the average size of cushion cut diamonds we simply multiply the diamond's length and width (both measured in millimeters) to create surface area. We also calculated the average length of cushion cut diamonds and list that below in millimeters.

Cushion Carat Weight Cushion MM Size Cushion Surface Area (sq. mm)
0.3 ct. 3.88 15.05
0.4 ct. 4.26 18.18
0.5 ct. 4.59 21.04
0.6 ct. 4.87 23.71
0.7 ct. 5.12 26.23
0.8 ct. 5.35 28.63
0.9 ct. 5.56 30.93
1 ct. 5.76 33.14
1.1 ct. 5.94 35.28
1.2 ct. 6.11 37.35
1.3 ct. 6.27 39.37
1.4 ct. 6.43 41.33
1.5 ct. 6.58 43.24
1.6 ct. 6.72 45.11
1.7 ct. 6.85 46.94
1.8 ct. 6.98 48.73
1.9 ct. 7.11 50.49
2 ct. 7.23 52.21
2.1 ct. 7.34 53.91
2.2 ct. 7.46 55.58
2.3 ct. 7.56 57.23
2.4 ct. 7.67 58.84
2.5 ct. 7.77 60.44
2.6 ct. 7.88 62.02
2.7 ct. 7.97 63.57
2.8 ct. 8.07 65.10
2.9 ct. 8.16 66.62
3 ct. 8.25 68.12
3.1 ct. 8.34 69.60
3.2 ct. 8.43 71.06
3.3 ct. 8.52 72.51
3.4 ct. 8.60 73.94
3.5 ct. 8.68 75.36
3.6 ct. 8.76 76.77
3.7 ct. 8.84 78.16
3.8 ct. 8.92 79.54
3.9 ct. 8.99 80.90
4 ct. 9.07 82.26
4.1 ct. 9.14 83.60
4.2 ct. 9.22 84.93
4.3 ct. 9.29 86.25
4.4 ct. 9.36 87.56
4.5 ct. 9.43 88.86
4.6 ct. 9.49 90.15
4.7 ct. 9.56 91.43
4.8 ct. 9.63 92.70
4.9 ct. 9.69 93.97
5 ct. 9.76 95.22

Cushion Cut Diamond Carat Size vs. Size in Millimeters Chart

The below chart shows our analysis of cushion cut diamonds of various carat weights with a smooth formula we regressed from the data. We used this analysis to help develop our visual carat weight for cushion cut diamonds, which you can see for any diamond available in our diamond search engine.

cushion cut diamond size chart

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