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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.
Elegant and noteworthy this rare blue diamond ring is a Bulgari custom-designed ring from a European collector during the 1960s. The owner gave the ring to his wife at an estimated value of $2.9 million. It is considered to be one of the most expensive jewels in the world.