Christie's member of staff displays (L-R) the 'Star of Kashmir' sapphire ring, a diamond ring (26.24 carats) and a natural cushion-shaped emerald ring (23.28 carats) during an auction preview in Geneva April 30, 2013. Items are expected to sell between CHF 2,400,000 to 2,900,000 (US $2,500,000 to 3,000,000), CHF 2,250,000 to 3,250,000 (US$ 2,400,000 to 3,400,000) and CHF 1,200,000 to1,700,000 (US$ 1,300,000 to 1,800,000) respectively when they go into auction May 15, 2013 in Geneva.