Ashlee Simpson
Size: Approximately 4 carats
Setting: Square cushion cut diamond set in pave diamonds
Estimated value: $100,000
Bling details: "It's definitely a big diamond!" the singer, 23, raved. "I go, 'Oh, my God, I can't believe its on my hand!" Hubby-to-be Pete Wentz, 28, designed the gem.
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