Shakudo is a Japanese alloy used in sheet metal inlay or wire inlay. The technique involves inlaying gold, silver and copper into a darkened copper base. Usually shakudo is composed of 75% copper and 4-25% gold and 5-20% antimony. In contemporary jewelry it can be found in Mokume Gane (from the Japanese for "wood Grain" Mokume-gane is a mixed-metal laminate showing distinctive layered patterns).

This 19th century kagamibuta netsuke depicts Emma Dai O, the King of Hell. The bowl is ivory; the disk is oxidized shakudo decorated with other gold and copper alloys.