Giant white diamond 'The Rock' makes debut in Dubai
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"The Middle East has always had such a great appreciation for important jewels and gemstones," Rahul Kadakia, international head of jewellery at Christie's, told AFP.
"We thought it would be nice for us to launch the diamond in an area where there are so many great collectors for important gems of this nature."
The previous auction record for the largest colourless diamond was a 163.41 carat sparkler which sold in November 2017 for $33.7 million, Christie's said.
Earlier this year, Sotheby's in London sold "The Enigma" -- the largest cut diamond ever to come to auction, at 555.55 carats -- for $4.3 million.