Egg-sized diamond called The Rock fetches €20.6m at Swiss sale

A Christie’s employee holds “The Rock” a white diamond of 228,31 carats who is the largest white diamond ever seen throughout auction market history, during a preview at Christie’s, in Geneva, Switzerland, Friday, May 6, 2022. The Rock is estimated between 19,000,000 – 30,000,000 CHF (Swiss Francs) will sold as hightlight of the Geneva Magnificent Jewels auction on 11 May 2022. (Salvatore Di Nolfi/Keystone via AP)

An egg-sized white diamond billed as the largest of its kind to go up for auction has sold for more than 21.6 million Swiss francs (€20.6 million) including fees.

The 228-carat pear-shaped G-Colour stone known as The Rock – with its platinum pendant mounting – has a gross weight of 2.2oz and dimensions of 2.1in by 1.2in, making it about the size of a medium hen’s egg.