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9. Mariah Carey’s Engagement Ring – $ 10 Million
They have mastered the art of spectacle, and Mariah Carey’s engagement ring was no different. It’s a 35-carat diamond ring believed to be worth $10 million and once considered the world’s most expensive engagement ring. After the engagement ended, Carey vended the ring for just $ 2.1 million—a bit of its original cost!