54 may be the same material applied at different times and subject to different doping conditions or maybe implemented by different materials of the wires 16 themselves the heterojunction formed can be a photocell a pn junction a thermocouple or other heterojunction of types known in the art in this way a heterogeneous wire 56 may be formed so that electricity may flow through a first portion of the wire 16 to junction element 52 and then to a second junction element 54 and then to a second portion of the wire referring now to fig6 more generally the present invention may be used to create a wires 70 that may be used alone or in the case of molybdenum or tungsten for example as a substrate to grow a surrounding super hard material such as crystalline diamond layer 72 by supersaturation of carbon into the tungsten or molybdenum wire that is exuded as a crystalline diamond to create a clad wire 74 the tungsten wire 70 may then be removed by chemical processes to create crystalline diamond wires or left in place to provide a better interface for metallurgical bonding typically the diamond will not completely surround the wire as shown but will coat only one side when the process is conducted with the wire supported on its side the clad wire 74 may be used for example as an electrical conductor with an insulator along its length for example to provide for an insulated microelectrode usable in medicine or the like referring to fig7 a set of these wires 74 may be sintered with metal particles into a cutting tool 80 optionally with an alignment to impart a directional hardness the diamond coating is shown surrounding a wire core.