Square or rectangular, the princess diamond has experienced increased popularity over the past few years. Although Princess cut engagement rings are the second most popular shape in the world, they are still relatively rare. In fact, at the time of writing, only about 5% of GIA-certified diamonds worldwide are princess cut. A mid-century beauty, the princess diamond was originally invented in 1961. The princess diamond is known for its beauty, style, and edge and is often set in a solitaire engagement ring setting. Since the princess diamond has from 49 to 144 intricate facets, depending on the size of the diamond, it has lots of sparkle. This square or rectangular diamond with pointed corners and a broad surface has brilliance and the princess diamond may disguise flaws, or inclusions, due to the additional facets which increase the diamond's inherent sparkle.