Emerald shape lab-grown diamond is usually rectangular but older, square cuts are still around. It is a step-cut diamond, that is, it has rows of facets usually 48-50 that resemble a staircase and usually are four-sided or elongated. The typical size of a 1-carat rectangular emerald cut would be 7×5 millimeters.
The look of an emerald shape lab-grown diamond is subtle and understated with less “flash,” or reflection and refraction than brilliant cuts. The flat planes of the outside edges allow for a variety of side stone shapes. Typical pairings would be two or three side baguettes, two half-moons, and other, smaller emeralds, but not trillions, as their sparkle makes the center emerald cut look flat.