There is more than one artist/group known as Black Diamonds 1) Switzerland Black Diamonds - four guys from the Rhine Valley in St. Gall Switzerland that seem to have sold their souls to the devil. 2) Sweden Black Diamonds - four woman from Eksjö, Sweden. https://www.facebook.com/blackdiamondseksjo/ 3. A 60's Australian psychedelic / garage rock band, called The Black Diamonds, from Lithgow, New South Wales, which were active from 1959 to 1971.