Stoneline Group SL32-D-C-992-3030 12" x 24" Shell Beige Limestone Bullnose Tumbled Coping 1.25" Thickness. The soft and delicate hues of the Shell Beige Collection are perfect for your entire home. The many qualities and properties of the beautiful Shell Beige collection are reason enough for the passion it awakens in luxury architecture. Any building or environment that wants to show unpretentious distinction in both its vertical walls and floors can find a perfect ally in the Shell Beige collection. It’s possible to appreciate the luminosity of this calcareous stone both in avant-garde designs and in more classical constructions.