The Diamant was an express train operated by the Deutsche Bundesbahn (DB), using different routes over the years. The name Diamant, Dutch for diamond, refers to the city of Antwerp, which is the European centre of diamond trade and has a diamond district. The initial service started in 1962 as a first-class-only FernTriebwagen linking the West-German capital Bonn with Antwerp, using a class diesel multiple unit (DMU).