It's no surprise that the most popular diamond shape is the classis round cut diamond. It's ability to convey brilliance and the range of settings it accommodates makes this diamond a favorite.

The number of square and princess cut diamond shapes brings second place. Round diamonds sold 75% in the last decade, especially for engagement rings, a study conducted by the Diamond Information Center earlier this year showed that 40% of recently engaged American brides chose round cuts, while 26% chose princess. Ending the three-most popular diamond cuts is the marquise cut diamond. http://www.lebaubles.com/solitaire-ring.htm