Christie’s and the Swiss luxury jeweler de GRISOGONO present The Art of de GRISOGONO, forming a partnership that will bring to auction the most exquisite diamonds ever offered to the market.On the eve of the 25th anniversary of de GRISOGONO, the first jewel — the largest flawless D-colour diamond ever to come to auction — will be unveiled in Hong Kong on 28 September, followed by a worldwide tour with stops in London, Dubai and New York, before returning to Geneva to feature in the Magnificent Jewels sale in November.