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The vivid blue diamond, known as "Bleu Royal" and set in a ring, is among the rarest ever to be unearthed. Max Fawcett, head of Christie's jewellery department in Geneva, said the diamond was unique because of its a deep rich blue colour and its unmodified pear brilliant shape. At its auction on Tuesday, Christie's sold dozens of rare jewellery pieces worth a combined total of more than $77 million. In a separate sale on Monday, Christie's sold a Rolex wristwatch worn by Marlon Brando in the 1979 movie "Apocalypse Now" for more than 4.5 million Swiss francs ($4.99 million). Two years ago, that same watch sold at auction for 2 million Swiss francs.

Persons: Carola Chiadini, Denis, Rahul Kadakia, Max Fawcett, Christie's, Fawcett, There's, Marlon Brando, Cécile Mantovani, Gabrielle Tétrault, Farber, Jonathan Oatis Organizations: REUTERS, Thomson Locations: Geneva, Switzerland, GENEVA, America

GENEVA, Nov 2 (Reuters) - The largest internally flawless fancy vivid blue diamond ever put up for auction could sell for up to $50 million at a Christie's sale of rare jewels in Geneva on Nov. 7, the auctioneer said on Thursday. Known as "Bleu Royal," this vivid blue diamond - which is set in a ring - is among the rarest ever to be unearthed. "What makes Bleu Royal so rare and special is its size. In 2016, Christie's sold a rare, 14.6-carat blue diamond known as the "Oppenheimer Blue" for more than $57 million. Two years ago the watch, now valued at between 1 million and 2 million Swiss francs, sold at auction for $2 million Swiss francs ($2.2 million).

Persons: Rahul Kadakia, Christie's, Oppenheimer, Kadakia, we've, Carola Chiadini, Denis Balibouse, Audrey Hepburn, Marlon Brando, Remi Guillemin, Guillemin, Gabrielle Tétrault, Farber, Cécile, Matthew Lewis Organizations: REUTERS, Thomson Locations: GENEVA, Geneva, Asia, Europe, Switzerland, Christie's

CNN —Hundreds of jewels once owned by late Austrian billionaire Heidi Horten have fetched a combined 176 million Swiss francs ($196 million) to become the most expensive private jewelry collection ever to appear at auction. Heidi Horten pictured wearing the Briollete of India necklace, which sold for 6.3 million Swiss francs ($7 million). The most valuable lot, a ruby and diamond Cartier ring that is “pigeon blood” in color, fetched just over 13 million Swiss francs ($14.5 million), despite Christie’s expecting bids as high as 18 million Swiss francs ($20 million). A 90-carat “Briolette of India” diamond necklace by jeweler Harry Winston also came in below estimate, selling for 6.3 million Swiss francs ($7 million). courtesy Christie'sElsewhere, however, a Bulgari diamond ring more than doubled its high estimate to fetch 9.1 million Swiss francs ($10.1 million).

The collection, acquired between the early 1970s until Horten's death last year, is also comprised of more than 100 Bulgari pieces. "What's important is that we have been completely transparent," Rahul Kadakia, international head of jewellery at Christie's, told Reuters. Christie's said it would make a "significant contribution" from its final proceeds to Jewish organisations to advance Holocaust research and education. "Of course we cannot erase history," said Max Fawcett, head of the jewellery department at Christie's in Geneva. Christie's will auction 400 pieces in Geneva on Wednesday and Friday and hold an online sale.

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