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.

4. A US blues band from Perry, Ohio, formed in 2006. called The Black Diamonds

5. A British recording act from the early 1900s, called The Black Diamonds Band

6. A US rock band from Haverhill, MA that started back in February of 2009. They released EPs Out in the Wild and Nothing Changes in 2016.
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Artist biography from last.fm