How big is a 4 carat cushion cut diamond?
By HeyGema™ · Updated
In short
A 4 carat cushion cut diamond measures about 8.9 x 8.9 mm. It faces up 14% smaller than a round diamond of the same weight. On a size 6 finger it covers 54% of the width. For the same weight, a round diamond is 10.2 mm.
- 8.9 x 8.9 mm4 carat cushion
- 0.35 x 0.35 inthe same in inches
- -14%face-up size vs a round
- 54%of a size 6 finger's width
Carat to mm calculator
About 8.9 x 8.9 mm
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
4 carat cushion diamond size
A well-cut 4 carat cushion cut diamond measures about 8.9 x 8.9 mm (0.35 x 0.35 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 0.80 grams.
4 carat cushion size by length-to-width ratio
The same weight can be long and narrow or short and wide. These are 4 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: 8.9 x 8.9 mm
- Width on the finger: 54% of a size 6 finger
- 1.10:1
- Length x width: 9.3 x 8.5 mm
- Width on the finger: 51% of a size 6 finger
- 1.20:1
- Length x width: 9.7 x 8.1 mm
- Width on the finger: 49% of a size 6 finger
- 1.30:1
- Length x width: 10.1 x 7.8 mm
- Width on the finger: 47% of a size 6 finger
4 carat cushion on a finger
- 4
- Finger width: 14.9 mm
- Cushion covers: 60%
- 5
- Finger width: 15.7 mm
- Cushion covers: 57%
- 6
- Finger width: 16.5 mm
- Cushion covers: 54%
- 7
- Finger width: 17.3 mm
- Cushion covers: 51%
- 8
- Finger width: 18.1 mm
- Cushion covers: 49%
- 9
- Finger width: 18.9 mm
- Cushion covers: 47%
Cushion sizes near 4 carat
- 3 carat
- Length x width: 8.1 x 8.1 mm
- Round of the same weight: 9.3 mm
- 3.5 carat
- Length x width: 8.5 x 8.5 mm
- Round of the same weight: 9.8 mm
- 4 (this page)
- Length x width: 8.9 x 8.9 mm
- Round of the same weight: 10.2 mm
- 5 carat
- Length x width: 9.6 x 9.6 mm
- Round of the same weight: 11.0 mm
- 6 carat
- Length x width: 10.2 x 10.2 mm
- Round of the same weight: 11.7 mm
4 carat in other shapes
Every row is a well-cut diamond of 4 carat. The last column is the face-up size against the cushion.
- Round
- Length x width: 10.2 mm
- Against cushion: +16%
- Oval
- Length x width: 12.7 x 8.7 mm
- Against cushion: +23%
- Princess
- Length x width: 8.7 x 8.7 mm
- Against cushion: +7%
- Emerald cut
- Length x width: 11.1 x 7.9 mm
- Against cushion: +21%
- Asscher
- Length x width: 8.7 x 8.7 mm
- Against cushion: -2%
- Radiant
- Length x width: 10.3 x 7.9 mm
- Against cushion: +14%
- Pear
- Length x width: 13.5 x 8.7 mm
- Against cushion: +13%
- Marquise
- Length x width: 16.5 x 8.3 mm
- Against cushion: +35%
- Heart
- Length x width: 10.3 x 10.3 mm
- Against cushion: -4%
- Trillion
- Length x width: 11.1 x 11.1 mm
- Against cushion: +1%
- Baguette
- Length x width: 12.7 x 6.3 mm
- Against cushion: +14%