“natural diamond die” in the context of manufacturing or technology. A die can refer to a tool or mold used in various manufacturing processes to shape, cut, or form materials into specific shapes. In the context of diamonds, a natural diamond die could potentially refer to a tool made from natural diamond material used for cutting or shaping other materials. Natural diamonds are incredibly hard and have exceptional cutting properties due to their hardness, making them useful in various industrial applications where precision cutting is required. However, since I don’t have real-time information beyond September 2021, I recommend searching for any recent developments or specific applications involving natural diamond dies that might have occurred after my last update.