228.31 carat white diamond as big as a GOLF BALL is the largest to ever go up for auction - Daily Mail

'The Rock,' a 228.31 carat pear-shaped stone roughly the size of a golf ball, is expected to sell for up to $30 million, the Christie's said.

The largest white diamond ever auctioned will go under the hammer in Geneva next week, part of a sale by Christie's that features two stones weighing more than 200 carats each. 'The Rock,' a 228.31 … [+2244 chars]

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