How big is a 0.33 carat marquise diamond?

By HeyGema™ · Updated

In short

A 0.33 carat marquise diamond measures about 7.2 x 3.6 mm. It faces up 16% bigger than a round diamond of the same weight. On a size 6 finger it covers 22% of the width. For the same weight, a round diamond is 4.5 mm.

Carat to mm calculator

About 7.2 x 3.6 mm

An estimate for a well-cut stone. A deep or shallow cut faces up smaller or bigger.

0.33 ct marquise
7.2 x 3.6 mm
0.33 ct round
4.5 mm
Side by side
0.33 ct round inside 0.33 ct marquise
A 0.33 carat marquise diamond beside a 0.33 carat round, to the same scale.

0.33 carat marquise diamond size

A well-cut 0.33 carat marquise diamond measures about 7.2 x 3.6 mm (0.28 x 0.14 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 0.066 grams.

0.33 carat marquise size by length-to-width ratio

The same weight can be long and narrow or short and wide. These are 0.33 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: 6.8 x 3.8 mm
Width on the finger: 23% of a size 6 finger
2.00:1
Length x width: 7.2 x 3.6 mm
Width on the finger: 22% of a size 6 finger
2.20:1
Length x width: 7.5 x 3.4 mm
Width on the finger: 21% of a size 6 finger

0.33 carat marquise on a finger

3.6 mm
3.6 mm stone on a 16.5 mm finger: it covers 22% of the widthA 0.33 carat marquise diamond on a size 6 finger.
4
Finger width: 14.9 mm
Marquise covers: 24%
5
Finger width: 15.7 mm
Marquise covers: 23%
6
Finger width: 16.5 mm
Marquise covers: 22%
7
Finger width: 17.3 mm
Marquise covers: 21%
8
Finger width: 18.1 mm
Marquise covers: 20%
9
Finger width: 18.9 mm
Marquise covers: 19%

Marquise sizes near 0.33 carat

0.25 carat
Length x width: 6.6 x 3.3 mm
Round of the same weight: 4.1 mm
0.33 (this page)
Length x width: 7.2 x 3.6 mm
Round of the same weight: 4.5 mm
0.5 carat
Length x width: 8.3 x 4.1 mm
Round of the same weight: 5.1 mm
0.75 carat
Length x width: 9.4 x 4.7 mm
Round of the same weight: 5.9 mm

0.33 carat in other shapes

Every row is a well-cut diamond of 0.33 carat. The last column is the face-up size against the marquise.

Round
Length x width: 4.5 mm
Against marquise: -14%
Oval
Length x width: 5.5 x 3.8 mm
Against marquise: -9%
Cushion
Length x width: 3.9 x 3.9 mm
Against marquise: -26%
Princess
Length x width: 3.8 x 3.8 mm
Against marquise: -21%
Emerald cut
Length x width: 4.8 x 3.5 mm
Against marquise: -10%
Asscher
Length x width: 3.8 x 3.8 mm
Against marquise: -27%
Radiant
Length x width: 4.5 x 3.5 mm
Against marquise: -16%
Pear
Length x width: 5.9 x 3.8 mm
Against marquise: -16%
Heart
Length x width: 4.5 x 4.5 mm
Against marquise: -28%
Trillion
Length x width: 4.8 x 4.8 mm
Against marquise: -25%
Baguette
Length x width: 5.5 x 2.76 mm
Against marquise: -15%

Questions

A 0.33 carat marquise diamond is about 7.2 x 3.6 mm at the usual 2.00:1 ratio.
Yes. Face-up, a 0.33 carat marquise is 16% bigger than a 0.33 carat round (4.5 mm).
There is no rule. The stone is 24% of the width of a size 4 finger and 20% of a size 8. Compare it with a ring you have tried on in the finger chart above.
Yes. A lab grown diamond has the same density as a mined one, so it measures the same for the same weight.

More size charts