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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.
One of the most romantic diamond shapes, heart shaped engagement rings have a distinctive cleft at the top and exhibit superior brilliance. 1  Total carat weight 1.03. $4,720. 2  Total carat weight 1.22. $4,370. 3  Total carat weight 0.90. $4,130. 4  Total carat weight 0.95. $4,360. 5  Total carat weight 1.05. $4,350. 6  Total carat weight 1.25. $4,850.