From Gwen Stefani's $500,000 sparkler to Mariah Carey's 35-carat emerald-cut diamond, here are the most expensive celebrity ...

She also can't keep her ring-clad hand to herself ... I've just dreamed of this moment my whole life," she sweetly wrote. The 8-carat marquise-shaped stone—which is estimated to have cost around ...

Jennifer Lopez will keep the 8.5-carat green diamond engagement ring from Ben Affleck, following their recent divorce ...

Alicia Brunker is a writer who covers celebrity, royal, and fashion news for InStyle.com. She joined InStyle's digital team in 2017, and previously contributed to ELLE, T: The New York Times Style ...