Mariah Carey, $10 Million
Proposed to by billionaire James Packer after dating for 18 months, Mariah broke off their engagement in 2016 and reportedly sold her engagement ring in 2018 after continuing to wear it for almost a year. The 35-carat diamond ring, worth $10 million at the time of the engagement, was sold to a Los Angeles jeweler for $1.2 million.