Kate Middleton, Prince William Back in 1981 when Lady Diana Spencer selected a stunning 18-carat sapphire and diamond engagement ring, people called it a 'commoner's ring,' as it was available for purchase by the general public at a mere $47,000. Fast forward to 2011, and the stunning ring, which now resides on Kate Middleton's left hand now has a retail value of $300,000!If you love the look of the royal sparkler, you don't have to fork over big money. You can purchase a replica ring made of...
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