A model poses with a pair of diamond earrings, the 14.54 carat ‘Apollo Blue’ (left) and the 16 carat ‘Artemis Pink’, during a photocall at Sotheby’s auction house in London  yesterday, ahead of their auction in Geneva on May 16. The earrings will be offered  as individual lots, with the ‘The Apollo Blue’ expected to realise £31mn-£40mn. ‘The Artemis Pink’ is expected to fetch £10mn-£15mn.