The square emerald-cut diamond, otherwise known as the Asscher cut, is a magnificent step-cut diamond. It could almost be described as octagonal, rather than square, as the four points are truncated slightly for mounting. Square emerald diamonds became popular during the 1920s, and many women today who prefer a more vintage, art deco look prefer its shape to the slightly more popular round-cut diamond. Plus, square emerald diamonds have the advantage of looking larger than round diamonds, even at the same weight. Finally, while round diamonds might have more sparkle, square emeralds are clearer and more brilliant. Costco offers a beautiful collection of square emerald diamonds. Check them out today, in stores or online at Costco.com!