Kate Middleton's engagement ring is the most valuable royal ring of all time

ok.co.uk:

Kate Middleton has the highest valued engagement ring compared to her royal counter parts, according to latest reports.The Duchess of Cambridge, who turned 40 this month, was proposed to by Prince William back in 2010, and money was clearly no option as he popped the question with a ring valued at £300,000.

Kate's ring, which is a 12ct oval-cut Ceylon sapphire surrounded by 14 solitaire diamonds, originally belonged to her mother-in-law, Princess Diana.The inherited ring has the largest carat stone compared to other royal's engagement rings, making Kate's the most valuable ring within the royal family.

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Creative Director of Steven Stone Jewellery, Maxwell Stone, says: "Kate Middleton's ring has the highest estimated value due to the huge 12ct Ceylon sapphire it features, not to mention the legacy of the ring which once belonged to Princess Diana. "And, while Kate Middleton's ring definitely sparked a huge trend for sapphire engagement rings, we've had requests for replicas of all these royal rings over the years, which just shows how much influence the royal ladies have on our style." Following on from Kate, the second highest value engagement ring belongs to wife of Prince Charles, Camilla Parker-Bowles.The 74-year-old Princess of Wales engagement ring is a 5ct emerald-cut diamond surrounded by three diamond baguettes, and has been estimated to be worth £212,000.