Christies New York Magnificent Jewells auction this April 17th will sell a 17-piece lot of vintage, art deco jewellery and objects from the estate of Huguette M. Clark, an heiress and Manhattan billionaire, who inherited a Montana copper fortune. The collection of her lavish vintage jewels includes a rare cushion cut pink diamond, dating back to 1910. The pink diamond weighs 9-carats and is mounted in a vintage style Belle Epoque setting. The diamond is predicted to fetch $6 to $8 million at auction update `wp_posts` set `post_content` = £3.8 million to £5.04 million) The 17-piece lot will also includes – A vintage 19.86-carat emerald cut diamond mounted on a white gold band, flaked with baguette diamond side stones – expected to sell for $2 million to $3 million. An art deco diamond line bracelet with round and baguette diamonds – expected to reach $300,000 to $500.000. A unique diamond, ruby and sapphire American flag brooch – expected to sell for $30,000 to $50,000. A vintage bracelet with different sized ruby, sapphire and emerald gems set in yellow gold the heiress bought in 1915 – expected to sell for £30,000 to £50,000. A beautiful pair of emerald drop earrings featuring natural pearls and diamonds from the early 20th century – expected to sell for $30,000 to $50,000.