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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.
This necklace is the queen of all heart-shaped diamond necklaces. 8 Bulgari Blue Diamond Ring â $15.7 million. This ring is also one of the most expensive rings in the world as it costs $15.7 million. The price of $1.8 million per carat beats the previous world record price of US$1.68 per carat for a blue diamond.