How big is a 8 carat emerald cut diamond?

By HeyGema™ · Updated

In short

A 8 carat emerald cut diamond measures about 14.0 x 10.0 mm. It faces up 4% bigger 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.

Carat to mm calculator

About 14.0 x 10.0 mm

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

8 ct emerald cut
14.0 x 10.0 mm
8 ct round
12.9 mm
Side by side
8 ct emerald cut inside 8 ct round
A 8 carat emerald cut diamond beside a 8 carat round, to the same scale.

8 carat emerald cut diamond size

A well-cut 8 carat emerald cut diamond measures about 14.0 x 10.0 mm (0.55 x 0.39 inches) at a length-to-width ratio of 1.40:1. It faces up 4% bigger than a round diamond of the same weight. It weighs 1.60 grams.

8 carat emerald cut 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.

1.30:1
Length x width: 13.5 x 10.4 mm
Width on the finger: 63% of a size 6 finger
1.40:1
Length x width: 14.0 x 10.0 mm
Width on the finger: 61% of a size 6 finger
1.50:1
Length x width: 14.5 x 9.7 mm
Width on the finger: 59% of a size 6 finger
1.60:1
Length x width: 15.0 x 9.4 mm
Width on the finger: 57% of a size 6 finger

8 carat emerald cut on a finger

10.0 mm
10.0 mm stone on a 16.5 mm finger: it covers 61% of the widthA 8 carat emerald cut diamond on a size 6 finger.
4
Finger width: 14.9 mm
Emerald cut covers: 67%
5
Finger width: 15.7 mm
Emerald cut covers: 64%
6
Finger width: 16.5 mm
Emerald cut covers: 61%
7
Finger width: 17.3 mm
Emerald cut covers: 58%
8
Finger width: 18.1 mm
Emerald cut covers: 55%
9
Finger width: 18.9 mm
Emerald cut covers: 53%

Emerald cut sizes near 8 carat

5 carat
Length x width: 12.0 x 8.5 mm
Round of the same weight: 11.0 mm
6 carat
Length x width: 12.7 x 9.1 mm
Round of the same weight: 11.7 mm
8 (this page)
Length x width: 14.0 x 10.0 mm
Round of the same weight: 12.9 mm
10 carat
Length x width: 15.1 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 emerald cut.

Round
Length x width: 12.9 mm
Against emerald cut: -4%
Oval
Length x width: 16.0 x 11.0 mm
Against emerald cut: +2%
Cushion
Length x width: 11.2 x 11.2 mm
Against emerald cut: -17%
Princess
Length x width: 11.0 x 11.0 mm
Against emerald cut: -11%
Asscher
Length x width: 11.0 x 11.0 mm
Against emerald cut: -19%
Radiant
Length x width: 13.0 x 10.0 mm
Against emerald cut: -6%
Pear
Length x width: 17.0 x 11.0 mm
Against emerald cut: -6%
Marquise
Length x width: 20.8 x 10.4 mm
Against emerald cut: +12%
Heart
Length x width: 13.0 x 13.0 mm
Against emerald cut: -20%
Trillion
Length x width: 14.0 x 14.0 mm
Against emerald cut: -17%
Baguette
Length x width: 16.0 x 8.0 mm
Against emerald cut: -6%

Questions

A 8 carat emerald cut diamond is about 14.0 x 10.0 mm at the usual 1.40:1 ratio.
Yes. Face-up, a 8 carat emerald cut is 4% bigger than a 8 carat round (12.9 mm).
There is no rule. The stone is wider than most fingers. 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