How big is a 5 carat oval diamond?

By HeyGema™ · Updated

In short

A 5 carat oval diamond measures about 13.7 x 9.4 mm. It faces up 6% bigger than a round diamond of the same weight. On a size 6 finger it covers 57% of the width. For the same weight, a round diamond is 11.0 mm.

Carat to mm calculator

About 13.7 x 9.4 mm

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

5 ct oval
13.7 x 9.4 mm
5 ct round
11.0 mm
Side by side
5 ct round inside 5 ct oval
A 5 carat oval diamond beside a 5 carat round, to the same scale.

5 carat oval diamond size

A well-cut 5 carat oval diamond measures about 13.7 x 9.4 mm (0.54 x 0.37 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 1.00 grams.

5 carat oval size by length-to-width ratio

The same weight can be long and narrow or short and wide. These are 5 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: 12.7 x 10.1 mm
Width on the finger: 61% of a size 6 finger
1.35:1
Length x width: 13.2 x 9.8 mm
Width on the finger: 59% of a size 6 finger
1.45:1
Length x width: 13.7 x 9.4 mm
Width on the finger: 57% of a size 6 finger
1.55:1
Length x width: 14.1 x 9.1 mm
Width on the finger: 55% of a size 6 finger

5 carat oval on a finger

9.4 mm
9.4 mm stone on a 16.5 mm finger: it covers 57% of the widthA 5 carat oval diamond on a size 6 finger.
4
Finger width: 14.9 mm
Oval covers: 63%
5
Finger width: 15.7 mm
Oval covers: 60%
6
Finger width: 16.5 mm
Oval covers: 57%
7
Finger width: 17.3 mm
Oval covers: 54%
8
Finger width: 18.1 mm
Oval covers: 52%
9
Finger width: 18.9 mm
Oval covers: 50%

Oval sizes near 5 carat

3.5 carat
Length x width: 12.1 x 8.4 mm
Round of the same weight: 9.8 mm
4 carat
Length x width: 12.7 x 8.7 mm
Round of the same weight: 10.2 mm
5 (this page)
Length x width: 13.7 x 9.4 mm
Round of the same weight: 11.0 mm
6 carat
Length x width: 14.5 x 10.0 mm
Round of the same weight: 11.7 mm
8 carat
Length x width: 16.0 x 11.0 mm
Round of the same weight: 12.9 mm

5 carat in other shapes

Every row is a well-cut diamond of 5 carat. The last column is the face-up size against the oval.

Round
Length x width: 11.0 mm
Against oval: -5%
Cushion
Length x width: 9.6 x 9.6 mm
Against oval: -19%
Princess
Length x width: 9.4 x 9.4 mm
Against oval: -13%
Emerald cut
Length x width: 12.0 x 8.5 mm
Against oval: -2%
Asscher
Length x width: 9.4 x 9.4 mm
Against oval: -20%
Radiant
Length x width: 11.1 x 8.5 mm
Against oval: -8%
Pear
Length x width: 14.5 x 9.4 mm
Against oval: -8%
Marquise
Length x width: 17.8 x 8.9 mm
Against oval: +9%
Heart
Length x width: 11.1 x 11.1 mm
Against oval: -22%
Trillion
Length x width: 12.0 x 12.0 mm
Against oval: -18%
Baguette
Length x width: 13.7 x 6.8 mm
Against oval: -7%

Questions

A 5 carat oval diamond is about 13.7 x 9.4 mm at the usual 1.45:1 ratio.
Yes. Face-up, a 5 carat oval is 6% bigger than a 5 carat round (11.0 mm).
There is no rule. The stone is 63% of the width of a size 4 finger and 52% 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