The radiant-cut was originally developed by Henry Grossbard in the late 1970s. It was the first diamond cut to combine the elegance of the emerald shape and the brilliance and fire of a round brilliant cut diamond. The radiant-cut diamond is a straight-edged rectangular or square stone and unlike the princess-cut diamond has cut or trimmed corners. The radiant-cut diamond usually has between 62 and 70 facets giving it its wonderful brilliance, fire, and scintillation. If you prefer the square or rectangular shapes of an Asscher or emerald-cut but want the fire and scintillation of a brilliant cut, you may want to consider a radiant. Corners are the signature of this diamond, and they help make the radiant-cut a popular and versatile choice for jewelry. A radiant-cut looks equally beautiful set with either baguette or round side-diamonds. Radiant-cut diamonds can vary in their degree of rectangularity.
Length-to-Width Ratio for Radiant-cut Diamonds: