How big is a 3 carat marquise diamond?
By HeyGema™ · Updated
In short
A 3 carat marquise diamond measures about 15.0 x 7.5 mm. It faces up 16% bigger than a round diamond of the same weight. On a size 6 finger it covers 45% of the width. For the same weight, a round diamond is 9.3 mm.
- 15.0 x 7.5 mm3 carat marquise
- 0.59 x 0.30 inthe same in inches
- +16%face-up size vs a round
- 45%of a size 6 finger's width
Carat to mm calculator
About 15.0 x 7.5 mm
An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.
3 carat marquise diamond size
A well-cut 3 carat marquise diamond measures about 15.0 x 7.5 mm (0.59 x 0.30 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 0.60 grams.
3 carat marquise size by length-to-width ratio
The same weight can be long and narrow or short and wide. These are 3 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: 14.2 x 7.9 mm
- Width on the finger: 48% of a size 6 finger
- 2.00:1
- Length x width: 15.0 x 7.5 mm
- Width on the finger: 45% of a size 6 finger
- 2.20:1
- Length x width: 15.7 x 7.2 mm
- Width on the finger: 43% of a size 6 finger
3 carat marquise on a finger
- 4
- Finger width: 14.9 mm
- Marquise covers: 50%
- 5
- Finger width: 15.7 mm
- Marquise covers: 48%
- 6
- Finger width: 16.5 mm
- Marquise covers: 45%
- 7
- Finger width: 17.3 mm
- Marquise covers: 43%
- 8
- Finger width: 18.1 mm
- Marquise covers: 41%
- 9
- Finger width: 18.9 mm
- Marquise covers: 40%
Marquise sizes near 3 carat
- 2.25 carat
- Length x width: 13.6 x 6.8 mm
- Round of the same weight: 8.5 mm
- 2.5 carat
- Length x width: 14.1 x 7.1 mm
- Round of the same weight: 8.8 mm
- 3 (this page)
- Length x width: 15.0 x 7.5 mm
- Round of the same weight: 9.3 mm
- 3.5 carat
- Length x width: 15.8 x 7.9 mm
- Round of the same weight: 9.8 mm
- 4 carat
- Length x width: 16.5 x 8.3 mm
- Round of the same weight: 10.2 mm
3 carat in other shapes
Every row is a well-cut diamond of 3 carat. The last column is the face-up size against the marquise.
- Round
- Length x width: 9.3 mm
- Against marquise: -14%
- Oval
- Length x width: 11.5 x 7.9 mm
- Against marquise: -9%
- Cushion
- Length x width: 8.1 x 8.1 mm
- Against marquise: -26%
- Princess
- Length x width: 7.9 x 7.9 mm
- Against marquise: -21%
- Emerald cut
- Length x width: 10.1 x 7.2 mm
- Against marquise: -10%
- Asscher
- Length x width: 7.9 x 7.9 mm
- Against marquise: -27%
- Radiant
- Length x width: 9.4 x 7.2 mm
- Against marquise: -16%
- Pear
- Length x width: 12.3 x 7.9 mm
- Against marquise: -16%
- Heart
- Length x width: 9.4 x 9.4 mm
- Against marquise: -28%
- Trillion
- Length x width: 10.1 x 10.1 mm
- Against marquise: -25%
- Baguette
- Length x width: 11.5 x 5.8 mm
- Against marquise: -15%