Oval vs Emerald cut diamond size

By HeyGema™ · Updated November 5, 2026

In short

A 1 carat oval measures 8.0 x 5.5 mm and a 1 carat emerald cut 7.0 x 5.0 mm. At the same weight an oval faces up about 2% larger than an emerald cut. In face-up terms, 1 carat of oval looks like a 1.09 carat round and 1 carat of emerald cut like a 1.06 carat round.

8.0 x 5.5 mm1 ct oval
7.0 x 5.0 mm1 ct emerald cut
-2%emerald cut face-up vs oval

Carat to mm calculator

ShapeGemCaratLength to width

About 7.0 x 5.0 mm

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

1 ct oval

8.0 x 5.5 mm

1 ct emerald cut

7.0 x 5.0 mm

Side by side

1 ct emerald cut inside 1 ct oval

A 1 carat oval and a 1 carat emerald cut diamond, to the same scale.

Oval vs Emerald cut diamond size at the same weight

At the same weight an oval faces up about 2% larger than an emerald cut. A 1 carat oval measures 8.0 x 5.5 mm and a 1 carat emerald cut 7.0 x 5.0 mm. A 1 carat oval faces up like a 1.09 carat round, and a 1 carat emerald cut like a 1.06 carat round.

0.5 carat: Oval length x width: 6.3 x 4.4 mm; Emerald cut length x width: 5.6 x 4.0 mm; Emerald cut face-up vs oval: -2%

0.75 carat: Oval length x width: 7.3 x 5.0 mm; Emerald cut length x width: 6.4 x 4.5 mm; Emerald cut face-up vs oval: -2%

1 carat: Oval length x width: 8.0 x 5.5 mm; Emerald cut length x width: 7.0 x 5.0 mm; Emerald cut face-up vs oval: -2%

1.5 carat: Oval length x width: 9.2 x 6.3 mm; Emerald cut length x width: 8.0 x 5.7 mm; Emerald cut face-up vs oval: -2%

2 carat: Oval length x width: 10.1 x 6.9 mm; Emerald cut length x width: 8.8 x 6.3 mm; Emerald cut face-up vs oval: -2%

3 carat: Oval length x width: 11.5 x 7.9 mm; Emerald cut length x width: 10.1 x 7.2 mm; Emerald cut face-up vs oval: -2%

Carat	Oval length x width	Emerald cut length x width	Emerald cut face-up vs oval
0.5 carat	6.3 x 4.4 mm	5.6 x 4.0 mm	-2%
0.75 carat	7.3 x 5.0 mm	6.4 x 4.5 mm	-2%
1 carat	8.0 x 5.5 mm	7.0 x 5.0 mm	-2%
1.5 carat	9.2 x 6.3 mm	8.0 x 5.7 mm	-2%
2 carat	10.1 x 6.9 mm	8.8 x 6.3 mm	-2%
3 carat	11.5 x 7.9 mm	10.1 x 7.2 mm	-2%

Oval vs Emerald cut on a finger

A 1 carat oval covers 33% of the width of a size 6 finger and a 1 carat emerald cut covers 30%. Long cuts sit along the finger, so their width is what shows across it.

5.7 mm stone on a 16.5 mm finger: it covers 35% of the widthA 1.5 carat emerald cut on a size 6 finger.

4: Finger width: 14.9 mm; 1.5 ct oval covers: 42%; 1.5 ct emerald cut covers: 38%

5: Finger width: 15.7 mm; 1.5 ct oval covers: 40%; 1.5 ct emerald cut covers: 36%

6: Finger width: 16.5 mm; 1.5 ct oval covers: 38%; 1.5 ct emerald cut covers: 35%

7: Finger width: 17.3 mm; 1.5 ct oval covers: 36%; 1.5 ct emerald cut covers: 33%

8: Finger width: 18.1 mm; 1.5 ct oval covers: 35%; 1.5 ct emerald cut covers: 32%

US ring size	Finger width	1.5 ct oval covers	1.5 ct emerald cut covers
4	14.9 mm	42%	38%
5	15.7 mm	40%	36%
6	16.5 mm	38%	35%
7	17.3 mm	36%	33%
8	18.1 mm	35%	32%

Match the look, not only the carat

Because an emerald cut needs about 1.03 carat to face up like 1 carat of oval, comparing by weight alone hides the difference. Compare millimeters, or put both stones side by side in the size comparison tool.

Oval and Emerald cut size charts

Full charts from 0.25 to 5 carat: Oval diamond size chart and Emerald cut diamond size chart.

Questions

At the same weight an oval faces up about 2% larger than an emerald cut. Face-up area is what you see from above; the oval has more of it at equal weight.

A 1 carat oval is about 8.0 x 5.5 mm and a 1 carat emerald cut about 7.0 x 5.0 mm, for a well-cut stone at the usual ratio.

A 2 carat oval is 10.1 x 6.9 mm and a 2 carat emerald cut is 8.8 x 6.3 mm. Face-up, the emerald cut is -2% against the oval.

A 1 carat oval covers 33% of the width of a size 6 finger and a 1 carat emerald cut 30%. The numbers change with ring size and with the stone's length-to-width ratio.