Christie's Jewellery specialist Helen Molesworth displays an emerald and diamond ring (L) estimated at $ 600,000 - to $ 800,000; a coloured diamond ring (2L) estimated at $ 1,400,000 - to $ 1,650,000; a sapphire ring (2R) estimated at $ 300,000 - to $ 410,000 and a single-stone diamond ring (R) estimated at $ 600,000 - to $ 680,000 during an auction preview in Geneva May 11, 2007. The jewels will be sold during a sale in Geneva May 17, 2007. REUTERS/Denis Balibouse (SWITZERLAND)