8 Unique Celebrity Engagement Rings — Match the Non-Traditional Bauble to the Famous Face!

Kate Middleton and Prince William

William slipped this 12-carat sapphire which is surrounded by 14 diamonds on Kate's hand. It originally belonged to the royal's late mother, Princess Diana. Reports claim Prince Charles nabbed it for $47,000 in the 1980s…and it's now worth a reported $500,000!