3) The Pink Star Diamond ($72 million)

Pink Star is a 59.60 carat diamond. Sotheby’s auctioned this precious stone in late 2013. The final bid far exceeded the estimated $61 million it was expected to fetch. In fact it rose to more than $83 million, but the buyer could not come up with the fee in time. The auction house had to retain the stone. Currently this beautiful piece of jewelry is valued at $72 million.

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