Natural Stone Resources SLTINDBLU1624G-5MEPC 16" x 24" 5cm Indian Bluestone Gauged Slate Modern Edge Pool Coping. Natural Stone Resources is a premier importer & distributor of quality natural stones from around the world. Whether you're looking to add coping to your masonry walls, columns, landscape, steps, or pools, the Indian Bluestone Slate Modern Coping is a beautiful choice. This coping provides a smooth surface and acts as a great finishing accent.