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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.
The 12 Most Expensive Weddings In History. Thirty years after his parents were married in the wedding of the century, Prince William is having his own giant wedding. Kate and William's wedding will cost an estimated $34 million. It will be perhaps the third most expensive wedding in history. Diana and Charles take the cake with a wedding costing $110 million when adjusted for inflation. Vanisha Mittal and Amit Bhatia come in third after paying an inflation-adjusted $66 million.