Another very rare precious metal is Rhodium. The name derives from the Greek “rhodon” meaning rose. This element also was discovered by William Wollaston right after his discovery of platinum in 1803. The element has a number of uses including electrical contacts, filters in mammography systems, and in nuclear reactors. The primary use of this element is in the catalytic converters for cars. It is used to change unburned hydrocarbons, carbon monoxide, and nitrogen oxide exhaust emissions into less noxious gases. All of the world’s major national mints also produce these rhodium coins in proof quality. This page updates with the current world spot prices as well as a fine assortment of this precious metal in coins and bullion.