The Wollaston Medal is a scientific award for geology, the highest award granted by the Geological Society of London. The medal is named after William Hyde Wollaston, and was first awarded in 1831. It was originally made of gold (1831–1845), then palladium, a metal discovered by Wollaston (1846–1860). Next in gold again (1861–1929) and then in palladium again (1930–present). Source: Wikipedia (en)