Lockheed Martin has filed a patent application for a 3D printer that prints diamonds. Their intention is to be able to 3D print diamond drill heads with complex geometries, as well as super-strong, lightweight saws, knives and armor, but in theory, such a printer could be used to print diamond jewelry. The proposed printer can print diamonds in any shape, which could result in a whole new market of intricate, complex diamond jewelry or other customized items. Read more at 3DPrint.com: https://3dprint.com/146562/diamond-3d-printer-lockheed/ ‎