Natural Stone Resources LIMOCEREF1224SEPC 12" x 24" x 5cm Ocean Reef Shellstone Coping. Shellstone is a Limestone composed by fossilized fragments of corals and shells. A soft neutral blend palette of linen, oatmeal, hazelnut, and light cream colors. Architects and Designers use the distinctive features of Shellstone to achieve their designs, and connecting with nature. Ideal material to be used in hard landscaping, pool and patio areas, driveways and walkways.