The radiant cut is the stud earring shape that splits the difference between the round brilliant and the emerald cut: it has the brilliance of a round (58+ facets) in the geometric outline of a square or rectangle with cropped corners. The result, when well-executed in CZ, is a stud earring that catches light aggressively without the softer, rounder profile of a traditional round solitaire. Rachel Zoe's version is set in rhodium over sterling silver with a butterfly back - a clean execution of a classic format that earns its place in the everyday rotation through the strength of the cut rather than the complexity of the design.