The cushion diamond combines a square cut with rounded corners. This classic cut has been around for 180–190 years, and was the most popular diamond shape for the first century of its existence. Cushion diamonds are still quite brilliant, but less lustrous than round diamonds. Many people prefer the high brilliance of cushion cut, while others prefer the high overall shine of round diamonds. Cushion diamonds are about 20% to 30% less expensive than their round cut counterparts. When jewelers cut a rough stone, more damage is done in shaping the round, so the cost of maintaining each carat is higher.