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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.
If you consider how rich Kate Middleton is, it can be said that Kateâs estimated net worth is $1 million. There is no doubt that this sum of money would be higher if it was viewed in conjunction with that of her husband, Prince William.