Diamond married school sweetheart Jayne Posner in 1963. The couple had two daughters, but divorced in 1969.
Later that year he wed Marcia Murphey, a production assistant, and they had two sons.
When they split in 1995, he had to pay £93.1million.
Their divorce settlement was the most expensive in the world at the time.
In November 2010, Diamond said he still hoped to settle down.
He said: 'I like having a woman. I like having someone to come home to, to make all of the hard work feel worth it.
'I need someone with me. And I want someone.
'I find that these things just tend to happen. It's like writing a great song. You can't plan to write a great song. It just happens to you. It drops in your lap. It's the same thing with a woman.'
-BANG! Showbiz