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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.
Here's how much Pippa Middleton and her fiancÃ© James Matthews are worth. 1  Queen Elizabeth II Net Worth: $550 Million. 2  Prince Charles Net Worth: $100 Million. 3  Prince William Net Worth: $40 Million. 4  Prince Harry Net Worth: $40 Million. 5  Prince Philip Net Worth: $30 Million. 6  Kate Middleton Net Worth: $10 Million.