The Radiant is a unique and hybrid cut comprised of 70 facets and distinctive trimmed
edges. Square-shaped Radiants typically have ratios between 1.00 and 1.05 while
rectangular Radiants can have ratios from over 1.05 anywhere up to 1.50.
Its versatile design combines the brilliance and depth of the round, Emerald and
Princess cuts making it a popular choice for all types of jewellery.
As it is a patented cut, it may be referred to as a Cut-Cornered Square on a laboratory
certificate (eg. GIA or AGS), or a Rectangular Brilliant if it has a ratio greater
4. History & Background
The first Radiant cut was designed by Henry Grossbard of the Radiant Cut Diamond
Company (RCDC) in 1977. Prior to this invention, all diamonds with square or step-cut
edges appeared less brilliant.
Grossbard invented a hybrid cutting style that revolutionised the industry's perceptions
towards square or rectangular stones as he managed to create a step-cut diamond
that possessed equal brilliance to triangular-faceted diamonds such as the oval
The Radiant is also the first cut to have a brilliant-facet pattern applied to both
the crown & pavilion. RCDC launched the Original Radiant Cut diamond brand in 2002.