An emerald cut diamond has a rectangular shape with cropped corners and is cut to accentuate a diamond's lustre. This style of cutting was originally used for the cutting of emeralds, but is equally effective with other gemstones, including diamonds. Popular in the Art Deco period, this shape is enjoying a huge revival in diamond jewellery. Emerald cut diamond engagement rings are increasingly fashionable. This shape demonstrates wider, more dramatic flashes of light.