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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.
When she marries Prince William, Kate Middleton will take on a royal title. Kate Middleton could become HRH Princess William of Wales when she weds the future king Photo: PA. 2:51AM BST 05 Apr 2011. All titles are in the gift of the Queen and it is up to the monarch to choose which one to bestow on her grandson and his new wife.