How big is a 1 carat oval diamond?
By HeyGema™ · Updated
In short
A 1 carat oval diamond measures about 8.0 x 5.5 mm. It faces up 6% bigger than a round diamond of the same weight. On a size 6 finger it covers 33% of the width. For the same weight, a round diamond is 6.5 mm.
- 8.0 x 5.5 mm1 carat oval
- 0.31 x 0.22 inthe same in inches
- +6%face-up size vs a round
- 33%of a size 6 finger's width
Carat to mm calculator
About 8.0 x 5.5 mm
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
1 carat oval diamond size
A well-cut 1 carat oval diamond measures about 8.0 x 5.5 mm (0.31 x 0.22 inches) at a length-to-width ratio of 1.45:1. It faces up 6% bigger than a round diamond of the same weight. It weighs 0.20 grams.
1 carat oval 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.
- 1.25:1
- Length x width: 7.4 x 5.9 mm
- Width on the finger: 36% of a size 6 finger
- 1.35:1
- Length x width: 7.7 x 5.7 mm
- Width on the finger: 35% of a size 6 finger
- 1.45:1
- Length x width: 8.0 x 5.5 mm
- Width on the finger: 33% of a size 6 finger
- 1.55:1
- Length x width: 8.3 x 5.3 mm
- Width on the finger: 32% of a size 6 finger
1 carat oval on a finger
- 4
- Finger width: 14.9 mm
- Oval covers: 37%
- 5
- Finger width: 15.7 mm
- Oval covers: 35%
- 6
- Finger width: 16.5 mm
- Oval covers: 33%
- 7
- Finger width: 17.3 mm
- Oval covers: 32%
- 8
- Finger width: 18.1 mm
- Oval covers: 30%
- 9
- Finger width: 18.9 mm
- Oval covers: 29%
Oval sizes near 1 carat
- 0.5 carat
- Length x width: 6.3 x 4.4 mm
- Round of the same weight: 5.1 mm
- 0.75 carat
- Length x width: 7.3 x 5.0 mm
- Round of the same weight: 5.9 mm
- 1 (this page)
- Length x width: 8.0 x 5.5 mm
- Round of the same weight: 6.5 mm
- 1.25 carat
- Length x width: 8.6 x 5.9 mm
- Round of the same weight: 6.9 mm
- 1.5 carat
- Length x width: 9.2 x 6.3 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 oval.
- Round
- Length x width: 6.5 mm
- Against oval: -5%
- Cushion
- Length x width: 5.6 x 5.6 mm
- Against oval: -19%
- Princess
- Length x width: 5.5 x 5.5 mm
- Against oval: -13%
- Emerald cut
- Length x width: 7.0 x 5.0 mm
- Against oval: -2%
- Asscher
- Length x width: 5.5 x 5.5 mm
- Against oval: -20%
- Radiant
- Length x width: 6.5 x 5.0 mm
- Against oval: -8%
- Pear
- Length x width: 8.5 x 5.5 mm
- Against oval: -8%
- Marquise
- Length x width: 10.4 x 5.2 mm
- Against oval: +9%
- Heart
- Length x width: 6.5 x 6.5 mm
- Against oval: -22%
- Trillion
- Length x width: 7.0 x 7.0 mm
- Against oval: -18%
- Baguette
- Length x width: 8.0 x 4.0 mm
- Against oval: -7%