Natural Stone Resources TRVSILVERFLAGT Random Tumbled Travertine Flagstone Silver - Flagstone is a sedimentary rock that is split into layers along bedding planes. The term describes flat pieces of natural stone that have been quarried and cut into various thicknesses. Flagstone is a product that is widely used in landscaping projects, with designs ranging from organic basic to ornate and formal. The advantage is to create your own individual taste and style. If a modern design is desired, stick to a rigid repeat, establishing clean lines. A rustic look will require random shapes and irregular sizes.