Emerald cut diamonds are cut‐cornered rectangles with step‐cut pavilions. They have large, open tables and instead of sparkling like brilliants cuts, they produce a “hall of mirrors effect.” The interplay of dark and light planes creates long, dramatic flashes of light, contributing to the appeal of the stone. Emerald cut diamonds vary from nearly square to a narrow rectangle. The classic emerald cut diamond has a length to width ratio of around 1.50.

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Length-To-Width Guide

IdealExcellentVery GoodGoodFairPoor
SQUARE 1.00 - 1.031.04 - 1.051.06 - 1.08> 1.08
RECTANGLE 1.501.40 - 1.501.30 - 1.39
or
1.51 - 1.60
1.20 - 1.29
or
1.61 - 1.80
1.15 - 1.19
or
1.81 - 1.90
< 1.15
or
> 1.90

QUALITY - excellent

SQUARE:
1.00 - 1.03
RECTANGLE:
1.50

QUALITY - very good

SQUARE:
1.00 - 1.03
RECTANGLE:
1.40 - 1.50

QUALITY - good

SQUARE:
1.00 - 1.03
RECTANGLE:
1.30 - 1.39 or 1.51 - 1.60

QUALITY - fair

SQUARE:
1.04 - 1.05
RECTANGLE:
1.20 - 1.29 or 1.61 - 1.80

QUALITY - poor

SQUARE:
1.06 - 1.08
RECTANGLE:
1.15 - 1.19 or 1.81 - 1.90
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