How big is a 8 carat radiant cut diamond?
By HeyGema™ · Updated
In short
A 8 carat radiant cut diamond measures about 13.0 x 10.0 mm. It faces up 2% smaller than a round diamond of the same weight. On a size 6 finger it covers 61% of the width. For the same weight, a round diamond is 12.9 mm.
- 13.0 x 10.0 mm8 carat radiant
- 0.51 x 0.39 inthe same in inches
- -2%face-up size vs a round
- 61%of a size 6 finger's width
Carat to mm calculator
About 13.0 x 10.0 mm
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
8 carat radiant diamond size
A well-cut 8 carat radiant cut diamond measures about 13.0 x 10.0 mm (0.51 x 0.39 inches) at a length-to-width ratio of 1.30:1. It faces up 2% smaller than a round diamond of the same weight. It weighs 1.60 grams.
8 carat radiant size by length-to-width ratio
The same weight can be long and narrow or short and wide. These are 8 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: 11.4 x 11.4 mm
- Width on the finger: 69% of a size 6 finger
- 1.15:1
- Length x width: 12.2 x 10.6 mm
- Width on the finger: 64% of a size 6 finger
- 1.30:1
- Length x width: 13.0 x 10.0 mm
- Width on the finger: 61% of a size 6 finger
- 1.40:1
- Length x width: 13.5 x 9.6 mm
- Width on the finger: 58% of a size 6 finger
8 carat radiant on a finger
- 4
- Finger width: 14.9 mm
- Radiant covers: 67%
- 5
- Finger width: 15.7 mm
- Radiant covers: 64%
- 6
- Finger width: 16.5 mm
- Radiant covers: 61%
- 7
- Finger width: 17.3 mm
- Radiant covers: 58%
- 8
- Finger width: 18.1 mm
- Radiant covers: 55%
- 9
- Finger width: 18.9 mm
- Radiant covers: 53%
Radiant sizes near 8 carat
- 5 carat
- Length x width: 11.1 x 8.5 mm
- Round of the same weight: 11.0 mm
- 6 carat
- Length x width: 11.8 x 9.1 mm
- Round of the same weight: 11.7 mm
- 8 (this page)
- Length x width: 13.0 x 10.0 mm
- Round of the same weight: 12.9 mm
- 10 carat
- Length x width: 14.0 x 10.8 mm
- Round of the same weight: 13.9 mm
8 carat in other shapes
Every row is a well-cut diamond of 8 carat. The last column is the face-up size against the radiant.
- Round
- Length x width: 12.9 mm
- Against radiant: +2%
- Oval
- Length x width: 16.0 x 11.0 mm
- Against radiant: +8%
- Cushion
- Length x width: 11.2 x 11.2 mm
- Against radiant: -12%
- Princess
- Length x width: 11.0 x 11.0 mm
- Against radiant: -6%
- Emerald cut
- Length x width: 14.0 x 10.0 mm
- Against radiant: +6%
- Asscher
- Length x width: 11.0 x 11.0 mm
- Against radiant: -13%
- Pear
- Length x width: 17.0 x 11.0 mm
- Against radiant: same
- Marquise
- Length x width: 20.8 x 10.4 mm
- Against radiant: +19%
- Heart
- Length x width: 13.0 x 13.0 mm
- Against radiant: -15%
- Trillion
- Length x width: 14.0 x 14.0 mm
- Against radiant: -11%
- Baguette
- Length x width: 16.0 x 8.0 mm
- Against radiant: same