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The Most Stunning Celebrity Engagement Rings

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November 15, 2010 - Chris Jackson/Getty Images Europe more pics like this »
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11. Kate Middleton
The fiancé: Prince William

The ring: An 18-carat oval sapphire surrounded by 14 diamonds.
It was Princess Diana's engagement ring. 

The price: An estimated $390,000

The proposal: October 2010

The marriage: April 2011