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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.
While the ring was originally estimated to fetch between $40,000 and $60,000 by Sothebyâs, it ultimately sold for $81,250. And while that might seem like a hefty sum for an engagement ring (the average price paid for an engagement ring in the U.S. is $5,431), it is pretty modest by celebrity standards.