A model poses with a 38.51-carat Colombian emerald and diamond bangle, designed by Etcetera, the largest no oil emerald ever to be auctioned, at a preview by Christie's ahead of their jewelry sale in Hong Kong, China May 19, 2015. According to the company, the diamond bangle is worth an estimated value of $1.5 to $2.3 million and will be sold at the auction on June 2. REUTERS/Tyrone Siu