Little need be said about the current craze for coloured stones. While the Lesedi La Rona, the second largest uncut diamond in history, failed to sell at auction in June, its chromatic sisters have made record-smashing news.
In May alone, the largest ever pear-shaped, fancy vivid “Unique Pink” hammered down at Sotheby’s for a record $31.6m (£21.9m); the “Aurora Green” went for an unprecedented $16.8m in Hong Kong; while the “Oppenheimer Blue” fetched a cool $57.5m at Christie’s, the most ever paid for any gem at auction.