How big is a 8 carat marquise diamond?
By HeyGema™ · Updated
In short
A 8 carat marquise diamond measures about 20.8 x 10.4 mm. It faces up 16% bigger than a round diamond of the same weight. On a size 6 finger it covers 63% of the width. For the same weight, a round diamond is 12.9 mm.
- 20.8 x 10.4 mm8 carat marquise
- 0.82 x 0.41 inthe same in inches
- +16%face-up size vs a round
- 63%of a size 6 finger's width
Carat to mm calculator
About 20.8 x 10.4 mm
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
8 carat marquise diamond size
A well-cut 8 carat marquise diamond measures about 20.8 x 10.4 mm (0.82 x 0.41 inches) at a length-to-width ratio of 2.00:1. It faces up 16% bigger than a round diamond of the same weight. It weighs 1.60 grams.
8 carat marquise 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.
- 1.80:1
- Length x width: 19.7 x 11.0 mm
- Width on the finger: 66% of a size 6 finger
- 2.00:1
- Length x width: 20.8 x 10.4 mm
- Width on the finger: 63% of a size 6 finger
- 2.20:1
- Length x width: 21.8 x 9.9 mm
- Width on the finger: 60% of a size 6 finger
8 carat marquise on a finger
- 4
- Finger width: 14.9 mm
- Marquise covers: 70%
- 5
- Finger width: 15.7 mm
- Marquise covers: 66%
- 6
- Finger width: 16.5 mm
- Marquise covers: 63%
- 7
- Finger width: 17.3 mm
- Marquise covers: 60%
- 8
- Finger width: 18.1 mm
- Marquise covers: 57%
- 9
- Finger width: 18.9 mm
- Marquise covers: 55%
Marquise sizes near 8 carat
- 5 carat
- Length x width: 17.8 x 8.9 mm
- Round of the same weight: 11.0 mm
- 6 carat
- Length x width: 18.9 x 9.4 mm
- Round of the same weight: 11.7 mm
- 8 (this page)
- Length x width: 20.8 x 10.4 mm
- Round of the same weight: 12.9 mm
- 10 carat
- Length x width: 22.4 x 11.2 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 marquise.
- Round
- Length x width: 12.9 mm
- Against marquise: -14%
- Oval
- Length x width: 16.0 x 11.0 mm
- Against marquise: -9%
- Cushion
- Length x width: 11.2 x 11.2 mm
- Against marquise: -26%
- Princess
- Length x width: 11.0 x 11.0 mm
- Against marquise: -21%
- Emerald cut
- Length x width: 14.0 x 10.0 mm
- Against marquise: -10%
- Asscher
- Length x width: 11.0 x 11.0 mm
- Against marquise: -27%
- Radiant
- Length x width: 13.0 x 10.0 mm
- Against marquise: -16%
- Pear
- Length x width: 17.0 x 11.0 mm
- Against marquise: -16%
- Heart
- Length x width: 13.0 x 13.0 mm
- Against marquise: -28%
- Trillion
- Length x width: 14.0 x 14.0 mm
- Against marquise: -25%
- Baguette
- Length x width: 16.0 x 8.0 mm
- Against marquise: -15%