The Duchess of Cambridge's engagement ring, which belonged to Prince William's late mother Princess Diana, was valued at £28,000 when Prince Charles proposed to her with it. Now valued at £300,000 It has 14 solitaire diamonds surrounding a 12-carat oval blue Ceylon sapphire, set in white gold.
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Although royal engagement rings are usually custom made, Diana selected hers from the Garrard jewelry collection catalog. The ring, which consists of 14 solitaire diamonds around a 12-carat sapphire set in white gold, now belongs to Duchess Kate Middleton.