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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.
Value of ring at the time of [its first] engagement in 1981: Â£28,000. For extra pub quiz points: Kateâs engagement ring, originally bought in 1981 for Princess Diana, has increased more than ten-fold in value in just over 30 years. 14 solitaire diamonds surround a 12-carat oval Ceylon blue sapphire set in white gold.