How big is a 1 carat cushion cut diamond?
By HeyGema™ · Updated
In short
A 1 carat cushion cut diamond measures about 5.6 x 5.6 mm. It faces up 14% smaller than a round diamond of the same weight. On a size 6 finger it covers 34% of the width. For the same weight, a round diamond is 6.5 mm.
- 5.6 x 5.6 mm1 carat cushion
- 0.22 x 0.22 inthe same in inches
- -14%face-up size vs a round
- 34%of a size 6 finger's width
Carat to mm calculator
About 5.6 x 5.6 mm
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
1 carat cushion diamond size
A well-cut 1 carat cushion cut diamond measures about 5.6 x 5.6 mm (0.22 x 0.22 inches) at a length-to-width ratio of 1.00:1. It faces up 14% smaller than a round diamond of the same weight. It weighs 0.20 grams.
1 carat cushion size by length-to-width ratio
The same weight can be long and narrow or short and wide. These are 1 carat sizes at each ratio. A longer ratio runs the stone along the finger and makes it look slimmer. The face-up area stays almost the same.
- 1.00:1
- Length x width: 5.6 x 5.6 mm
- Width on the finger: 34% of a size 6 finger
- 1.10:1
- Length x width: 5.9 x 5.3 mm
- Width on the finger: 32% of a size 6 finger
- 1.20:1
- Length x width: 6.1 x 5.1 mm
- Width on the finger: 31% of a size 6 finger
- 1.30:1
- Length x width: 6.4 x 4.9 mm
- Width on the finger: 30% of a size 6 finger
1 carat cushion on a finger
- 4
- Finger width: 14.9 mm
- Cushion covers: 38%
- 5
- Finger width: 15.7 mm
- Cushion covers: 36%
- 6
- Finger width: 16.5 mm
- Cushion covers: 34%
- 7
- Finger width: 17.3 mm
- Cushion covers: 32%
- 8
- Finger width: 18.1 mm
- Cushion covers: 31%
- 9
- Finger width: 18.9 mm
- Cushion covers: 30%
Cushion sizes near 1 carat
- 0.5 carat
- Length x width: 4.4 x 4.4 mm
- Round of the same weight: 5.1 mm
- 0.75 carat
- Length x width: 5.1 x 5.1 mm
- Round of the same weight: 5.9 mm
- 1 (this page)
- Length x width: 5.6 x 5.6 mm
- Round of the same weight: 6.5 mm
- 1.25 carat
- Length x width: 6.0 x 6.0 mm
- Round of the same weight: 6.9 mm
- 1.5 carat
- Length x width: 6.4 x 6.4 mm
- Round of the same weight: 7.4 mm
1 carat in other shapes
Every row is a well-cut diamond of 1 carat. The last column is the face-up size against the cushion.
- Round
- Length x width: 6.5 mm
- Against cushion: +16%
- Oval
- Length x width: 8.0 x 5.5 mm
- Against cushion: +23%
- Princess
- Length x width: 5.5 x 5.5 mm
- Against cushion: +7%
- Emerald cut
- Length x width: 7.0 x 5.0 mm
- Against cushion: +21%
- Asscher
- Length x width: 5.5 x 5.5 mm
- Against cushion: -2%
- Radiant
- Length x width: 6.5 x 5.0 mm
- Against cushion: +14%
- Pear
- Length x width: 8.5 x 5.5 mm
- Against cushion: +13%
- Marquise
- Length x width: 10.4 x 5.2 mm
- Against cushion: +35%
- Heart
- Length x width: 6.5 x 6.5 mm
- Against cushion: -4%
- Trillion
- Length x width: 7.0 x 7.0 mm
- Against cushion: +1%
- Baguette
- Length x width: 8.0 x 4.0 mm
- Against cushion: +14%