‘The Blue’ diamond is estimated to achieve SFr. 19,000,000 – 23,000,000 (US$21 m…

‘The Blue’ diamond is estimated to achieve SFr. 19,000,000 – 23,000,000 (US$21 million- US$25 million) when it goes under the hammer at Christie’s Magnificent Jewels auction on 14 May 2014