Grey Granite Cobblestone is also known as Belgian block. These ancient stones come in a wide variety of hues. Some are traditional colors of grey, while others are a lovely combination. Regulation stones are worn with a relatively flat top. Our creative customers have incorporated this material into driveways, roads, small- and large-scale landscaping, and even rooftop patios. Grey Granite Cobblestone tends to have a more rounded top than regulation stones and produces wider joints. Customers frequently lay the stones on their sides, which exposes the original split stone face and allows for greater coverage.