Asscher vs Emerald cut diamond size

By HeyGema™ · Updated November 5, 2026

In short

A 1 carat asscher measures 5.5 x 5.5 mm and a 1 carat emerald cut 7.0 x 5.0 mm. At the same weight an emerald cut faces up about 23% larger than an asscher. In face-up terms, 1 carat of asscher looks like a 0.78 carat round and 1 carat of emerald cut like a 1.06 carat round.

5.5 x 5.5 mm1 ct asscher
7.0 x 5.0 mm1 ct emerald cut
+23%emerald cut face-up vs asscher

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 asscher

5.5 x 5.5 mm

1 ct emerald cut

7.0 x 5.0 mm

Side by side

1 ct asscher inside 1 ct emerald cut

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

Asscher vs Emerald cut diamond size at the same weight

At the same weight an emerald cut faces up about 23% larger than an asscher. A 1 carat asscher measures 5.5 x 5.5 mm and a 1 carat emerald cut 7.0 x 5.0 mm. A 1 carat asscher faces up like a 0.78 carat round, and a 1 carat emerald cut like a 1.06 carat round.

0.5 carat: Asscher 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 asscher: +23%

0.75 carat: Asscher length x width: 5.0 x 5.0 mm; Emerald cut length x width: 6.4 x 4.5 mm; Emerald cut face-up vs asscher: +23%

1 carat: Asscher length x width: 5.5 x 5.5 mm; Emerald cut length x width: 7.0 x 5.0 mm; Emerald cut face-up vs asscher: +23%

1.5 carat: Asscher length x width: 6.3 x 6.3 mm; Emerald cut length x width: 8.0 x 5.7 mm; Emerald cut face-up vs asscher: +23%

2 carat: Asscher length x width: 6.9 x 6.9 mm; Emerald cut length x width: 8.8 x 6.3 mm; Emerald cut face-up vs asscher: +23%

3 carat: Asscher length x width: 7.9 x 7.9 mm; Emerald cut length x width: 10.1 x 7.2 mm; Emerald cut face-up vs asscher: +23%

Carat	Asscher length x width	Emerald cut length x width	Emerald cut face-up vs asscher
0.5 carat	4.4 x 4.4 mm	5.6 x 4.0 mm	+23%
0.75 carat	5.0 x 5.0 mm	6.4 x 4.5 mm	+23%
1 carat	5.5 x 5.5 mm	7.0 x 5.0 mm	+23%
1.5 carat	6.3 x 6.3 mm	8.0 x 5.7 mm	+23%
2 carat	6.9 x 6.9 mm	8.8 x 6.3 mm	+23%
3 carat	7.9 x 7.9 mm	10.1 x 7.2 mm	+23%

Asscher vs Emerald cut on a finger

A 1 carat asscher 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 asscher covers: 42%; 1.5 ct emerald cut covers: 38%

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

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

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

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

US ring size	Finger width	1.5 ct asscher 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 of about 0.73 carat faces up like 1 carat of asscher, comparing by weight alone hides the difference. Compare millimeters, or put both stones side by side in the size comparison tool.

Asscher and Emerald cut size charts

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

Questions

At the same weight an emerald cut faces up about 23% larger than an asscher. Face-up area is what you see from above; the emerald cut has more of it at equal weight.

A 1 carat asscher is about 5.5 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 asscher is 6.9 x 6.9 mm and a 2 carat emerald cut is 8.8 x 6.3 mm. Face-up, the emerald cut is +23% against the asscher.

A 1 carat asscher 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.