The radiant cut diamond shape can be considered to be an improved version of the princess cut, but combining its best features with those of the emerald cut. The princess cut was one of the most important new cuts or shapes for diamonds since the invention or perfection of the modern brilliant cut over 60 years ago.
Because of its design, this cut requires more weight to be directed toward the diamond's depth in order to maximize brilliance. Depth percentages of 70% to 78% are not uncommon. This square or rectangular cut combines the elegance of the emerald shape diamond with the brilliance of the round, and its 70 facets maximize the effect of its color refraction.
The radiant cut is a hybrid cut, a cross between a princess cut and an emerald cut. It combines the best features of the round brilliant cut, the square shape of the princess or square baguette cut, and the cut corners of the emerald cut. Like the princess cut, it is normally used for near-square stones rather than oblong ones.
Radiant cut diamonds are principally used for important center stones primarily for rings but also for pendant. They are rarely used for earrings or as side stones because they are hard to calibrate and match. To get matched pairs you may have to sort through a hundred stones or re-cut to calibrate. Emerald - an emerald cut diamond shape is usually rectangular. The flat planes of the outside edges allow for a variety of side stones shapes.
Typical pairing would be two or three side baguetts, two half-moons and other smaller emeralds but not trillions as their sparkle makes the center emerald cut look flat.
A radiant cut with a length to width ratio of less than or equal to 1.05:1 will appear square to the observer. While a squarer radiant-cut diamond is the preference of many, some people prefer a slightly rectangular diamond.
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