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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.
Kateâs ring has shot up in value and is worth three times more than the Queen's engagement ring. The Queen's modest engagement token, presented by Prince Phillip in 1947, has increased in value from Â£10,000 to Â£100,000 today and comes second on the list.