Manufactured stone is a concrete product designed to simulate the look of real stone at a lower cost. Unlike real stone masonry, manufactured stone units are generally thin, and are bonded to a supporting wall. Riverside features Cultured Stone by Boral -- the original manufactured stone whose name has become widely used to identify all manufactured stone. Riverside stocks a variety of colors and styles of Cultured Stone, and even special orders an be filled within a few days. As manufactured stone is not installed using masonry, great care must be taken to select an installation method that prevents water penetration to interior walls.