The jewellery and watch auction to be held in Geneva on November 14 will offer some of Sotheby's rare pieces. A white flawless diamond of 84.37 carats, which is regarded as the largest cut diamond ever to be sold at an auction, is expected to fetch about SFR 150 million. Sotheby’s will also be offering its blue and pear-shaped diamond, which is expected to generate SFR 4 million. The Sotheby’s collection will be amongst 387 lots of jewellery and 158 watches.