Say the words engagement ring and the first thing that often comes to mind is the classic ring, the brilliant-cut round solitaire, most often set in a white gold mount on a yellow gold band. But the times are changing and other cuts are becoming the new trend. Bloomberg has a report on diamond cut trends for engagement rings. While the round is still the most popular shape, research from the Diamond Information Center reports that square cuts are now a full 30 percent of the market up from just nine percent in 1999.
http://www.gadgets.luxist.com/2007/11/28/square-cut-diamonds-popular-with-modern-brides/
See also inexpensive engagement rings