Cushion vs Emerald cut diamond size

By HeyGema™ · Updated November 5, 2026

In short

A 1 carat cushion measures 5.6 x 5.6 mm and a 1 carat emerald cut 7.0 x 5.0 mm. At the same weight an emerald cut faces up about 21% larger than a cushion. In face-up terms, 1 carat of cushion looks like a 0.80 carat round and 1 carat of emerald cut like a 1.06 carat round.

5.6 x 5.6 mm1 ct cushion
7.0 x 5.0 mm1 ct emerald cut
+21%emerald cut face-up vs cushion

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 cushion

5.6 x 5.6 mm

1 ct emerald cut

7.0 x 5.0 mm

Side by side

1 ct cushion inside 1 ct emerald cut

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

Cushion vs Emerald cut diamond size at the same weight

At the same weight an emerald cut faces up about 21% larger than a cushion. A 1 carat cushion measures 5.6 x 5.6 mm and a 1 carat emerald cut 7.0 x 5.0 mm. A 1 carat cushion faces up like a 0.80 carat round, and a 1 carat emerald cut like a 1.06 carat round.

0.5 carat: Cushion length x width: 4.4 x 4.4 mm; Emerald cut length x width: 5.6 x 4.0 mm; Emerald cut face-up vs cushion: +21%

0.75 carat: Cushion length x width: 5.1 x 5.1 mm; Emerald cut length x width: 6.4 x 4.5 mm; Emerald cut face-up vs cushion: +21%

1 carat: Cushion length x width: 5.6 x 5.6 mm; Emerald cut length x width: 7.0 x 5.0 mm; Emerald cut face-up vs cushion: +21%

1.5 carat: Cushion length x width: 6.4 x 6.4 mm; Emerald cut length x width: 8.0 x 5.7 mm; Emerald cut face-up vs cushion: +21%

2 carat: Cushion length x width: 7.1 x 7.1 mm; Emerald cut length x width: 8.8 x 6.3 mm; Emerald cut face-up vs cushion: +21%

3 carat: Cushion length x width: 8.1 x 8.1 mm; Emerald cut length x width: 10.1 x 7.2 mm; Emerald cut face-up vs cushion: +21%

Carat	Cushion length x width	Emerald cut length x width	Emerald cut face-up vs cushion
0.5 carat	4.4 x 4.4 mm	5.6 x 4.0 mm	+21%
0.75 carat	5.1 x 5.1 mm	6.4 x 4.5 mm	+21%
1 carat	5.6 x 5.6 mm	7.0 x 5.0 mm	+21%
1.5 carat	6.4 x 6.4 mm	8.0 x 5.7 mm	+21%
2 carat	7.1 x 7.1 mm	8.8 x 6.3 mm	+21%
3 carat	8.1 x 8.1 mm	10.1 x 7.2 mm	+21%

Cushion vs Emerald cut on a finger

A 1 carat cushion covers 34% 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 cushion covers: 43%; 1.5 ct emerald cut covers: 38%

5: Finger width: 15.7 mm; 1.5 ct cushion covers: 41%; 1.5 ct emerald cut covers: 36%

6: Finger width: 16.5 mm; 1.5 ct cushion covers: 39%; 1.5 ct emerald cut covers: 35%

7: Finger width: 17.3 mm; 1.5 ct cushion covers: 37%; 1.5 ct emerald cut covers: 33%

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

US ring size	Finger width	1.5 ct cushion covers	1.5 ct emerald cut covers
4	14.9 mm	43%	38%
5	15.7 mm	41%	36%
6	16.5 mm	39%	35%
7	17.3 mm	37%	33%
8	18.1 mm	35%	32%

Match the look, not only the carat

Because an emerald cut of about 0.75 carat faces up like 1 carat of cushion, comparing by weight alone hides the difference. Compare millimeters, or put both stones side by side in the size comparison tool.

Cushion and Emerald cut size charts

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

Questions

At the same weight an emerald cut faces up about 21% larger than a cushion. Face-up area is what you see from above; the emerald cut has more of it at equal weight.

A 1 carat cushion is about 5.6 x 5.6 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 cushion is 7.1 x 7.1 mm and a 2 carat emerald cut is 8.8 x 6.3 mm. Face-up, the emerald cut is +21% against the cushion.

A 1 carat cushion covers 34% 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.