The radiant cut diamond is the first square cut (the second being the princess) to have a complete brilliant-cut facet pattern applied to both the crown and pavilion, creating a vibrant and lively square diamond. First popular in the 1980's, the cropped corner square shape of the radiant is a nice bridge between a cushion and a princess cut, and for that reason looks beautiful set with both rounded or square cornered diamonds.

In longer (more rectangular) radiant cut diamonds, a bow-tie effect is more likely (although not as common as in oval, marquise, and pear cuts), varying from near invisible to severe. The visibility of a bow-tie effect cannot be ascertained by reviewing the diamond certificate or dimensions, but only upon visual inspection.

There are diverse preferences when it comes to shape in radiant cut diamonds, from a perfectly square 1.00 length to width ratio (any ratio of 1.05 or less will appear square to the naked eye), to a more traditional rectangle. The rectangular radiant cut is an excellent option for buyers who like the emerald cut shape, but want something with the brilliance of a round. The square radiant looks very similar to a princess cut, but with cropped corners. Once set, a square radiant and a princess look virtually identical, since the prongs cover the corners.

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Length-To-Width Guide

IdealExcellentVery GoodGoodFairPoor
SQUARE 1.00 - 1.031.04 - 1.051.06 - 1.08> 1.08
RECTANGLE 1.50 - 1.751.20 - 1.301.15 - 1.19
or
1.31 - 1.35
1.10 - 1.14
or
1.36 - 1.40
1.08 - 1.09
or
1.41 - 1.50
< 1.08
or
> 1.50

QUALITY - excellent

SQUARE:
1.00 - 1.03
RECTANGLE:
1.50 - 1.75

QUALITY - very good

SQUARE:
1.00 - 1.03
RECTANGLE:
1.20 - 1.30

QUALITY - good

SQUARE:
1.00 - 1.03
RECTANGLE:
1.15 - 1.19 or 1.31 - 1.35

QUALITY - fair

SQUARE:
1.04 - 1.05
RECTANGLE:
1.10 - 1.14 or 1.36 - 1.40

QUALITY - poor

SQUARE:
1.06 - 1.08
RECTANGLE:
1.08 - 1.09 or 1.41 - 1.50
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