Polished and ground stone adzes, gouges, and other implements, some of which are made from jade-like stone, have also been recorded in areas of Island Melanesia and eastern New Guinea associated with the Lapita culture. These were considered valuable currency and were primarily used to trade for goods. In 2012, a Lapita culture jadeite gouge used for wood carving was found in Emirau Island in the Bismarck Archipelago. It was dated to around 3,300 BP, but the origin of the jade material is unknown. Similar prestige stone tools have also been found in New Caledonia.