The Blue Diamonds were a Dutch 1960s doo-wop duo, best known for their million-selling chart-topping single, Ramona. Indo (Dutch-Indonesian) brothers Ruud de Wolff (born 12 May 1941, died December 2000) and Riem de Wolff (born 15 April 1943) founded the group shortly after immigrating to The Netherlands in 1949. They were born in Batavia (now Jakarta), Indonesia. Called the 'Dutch Everly Brothers', The Blue Diamonds covered many Everly Brothers songs, but became famous in 1960 with their version of "Ramona", a song originally written for the 1928 film, Ramona.

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