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Kate Middleton's engagement ring cost Â£28,000 when bought by Prince Charles for Diana in 1981. Kate Middleton's engagement ring cost Â£28,000 when it was bought by Prince Charles for the then Diana Spencer in February 1981. In today's prices the oval 18-carat blue sapphire surrounded by 14 diamonds would cost Â£85,000 - although Diana's is priceless.
Born on: 9th Jan 82 Born in: United Kingdom Marital status: Married Occupation: The Duchess of Cambridge. Kate Middleton net worth is estimated at $1 million. Kate Middleton, also known by her royal title of âThe Duchess of Cambridgeâ is the wife of Prince William and a member of the British Royal family.