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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.
Kate wore the luxurious ring during her engagement to Prince William in 2010 [GETTY] 1  The blue sapphire, originally the engagement ring of Prince Williamâs mother Princess Diana, was worth Â£28,000 when bought in 1981, but is now valued at Â£300,000. The sparkler heads a list of the worldâs top 20 most famous engagement rings, showing how much each one has Â­appreciated since purchase.