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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.
It was originally the engagement ring of the late Princess Diana and was worth Â£28,000 when it was bought in 1981, but is now valued at Â£300,000. The stunning sparkler sits at the top of a list of the 20 famous rings, placed in order of how much each has appreciated in value since they were first given.