Emerald Cut Diamond: 
The emerald cut is usually rectangular but older.A rectangular shape with cut corners that resemble stair steps (it's often called a step cut) and its name was taken from the most popular shape for emeralds in the 1920s. It is a step-cut diamond; that is, it has rows of facets - usually 48 to 50 - that resemble as staircase and usually are four-sided or elongated. The typical size of a 1 carat rectangular Emerald Cut would be 7 by 5 mm.
