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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.
Kate Middleton Net Worth is $1 Million. 1  Kate Middleton net worth: Kate Middleton, also known as Catherine Elizabeth Middleton, and Catherine, Duchess of Cambridge, is married to Prince William and has a net worth of $1 million dollars. 2  Related Topics: