The Blue Diamonds were an Indonesian and Dutch 1960s rock and roll duo, best known for their million-selling chart-topping single, "Ramona".

[1] Called the "Dutch – Indonesian 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.

The Blue Diamonds up-tempo version of it (changing it from the original 34 rhythm to a 44 one) reached the American Billboard Hot 100 at number 72 in 1960.

[2] Although their last hit was in 1971, they continued to perform together up until Ruud de Wolff died from bladder cancer at the end of the year 2000.

At the time of his death, Riem had just been diagnosed with lung and liver cancer and had been suffering from the effects of a recent stroke.