Gallery: Breaking with tradition! Did you know these female stars proposed to their men? (BANG Showbiz)The 88-year-old actress is auctioning off the engagement ring from Beatty as well as the one given to her by her second husband Anthony Newley.
Joan, who has been married five times, quipped that she was selling the rings as "like everything else, my fingers have put on weight", although the real reason is because "jewellery is meant to be worn, and these pieces belong to a different time in my life".
The star recalled in her 2013 memoir 'Passion for Life' that she called off her engagement to Warren amid rumours that he was having a number of high-profile affairs.
Joan wrote: "It was a sad ending, but I knew that our relationship of almost two years was doomed. Marriage to Warren would never have lasted because he simply loved the ladies too much. " Meanwhile, Collins recently claimed that modern men are "suffering from the rise of anti-maleness" as a result of the #MeToo movement.