It wasn't the only mega-diamond to go under the hammer at Tuesday's auction in the hotel room packed with well-heeled bidders. Beneath a row of three enormous chandeliers that cast panther-like shadows on the ceiling, the participants eagerly pounced at the jewels while competing with bidders from around the world calling in to Christie's employees seated in rows on both sides of the room.But perhaps the buyers weren't entirely immune to the harsh financial climate in Europe â¿¿ or at least some Geneva version of it. Two plus-sized diamonds did not sell Tuesday night. A yellow diamond with 70.19 carats failed to sell because the final bid was 2.8 million Swiss francs, just slightly below the reserve price. A 12.16 carat pink diamond didn't sell because the final bid was 1.8 million francs, well under the reserve price. On Wednesday, in addition to the blue briolette diamond, Sotheby's also is putting on the block a conch pearl, enamel and diamond Cartier bracelet that formerly belonged to Queen Victoria Eugenia of Spain that's expected to sell for up to $1.4 million. The Archduke Joseph Diamond joins a long list of other fabulous jewels, watches and other luxury goods sold in Geneva. Here's a look at the city's most eye-popping diamonds put up for auction in recent years: ROYAL CONNECTIONS In May 2012, Sotheby's sold the 34.98 carat Beau Sancy diamond to an anonymous bidder for $9.7 million. Marie de Medici had worn it at her coronation as Queen Consort of Henry IV in France in 1610. Then the diamond passed among the royal families in France, England, the Netherlands and Prussia. It was sold by the Royal House of Prussia. Sotheby's also sold for $3.87 million the Murat Tiara, a pearl-and-diamond tiara created for the marriage of a prince whose ancestors included the husband of Caroline Bonaparte, Napoleon's sister. Christie's auctioned off a 32.08-carat Burmese ruby and diamond ring that sold for $6.7 million, a world record price for a ruby sold at auction.