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.
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.
Her Royal Highness The Duchess of Cambridge's sapphires. Her engagement ring previously belonged to the late Princess of Wales, and the matching earrings are thought to be a modified version of those worn by Diana as well (although unconfirmed).