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The jewels of the world's most famous auction house

  • Displayed with the 100-carat diamond was "The Sunrise Ruby" (pictured on the right). The Cartier-mounted ring will go on sale in Geneva on May 12 and is expected to fetch between $12-$18M USD.(REUTERS/Tyrone Siu)
    1/10

    A model displays both a 100.20 carats and a 25.59 carats, that is known as 'The Sunrise Ruby', diamond rings at a pre-auction viewing at Sotheby's in Hong Kong

    Displayed with the 100-carat diamond was "The Sunrise Ruby" (pictured on the right). The Cartier-mounted ring will go on sale in Geneva on May 12 and is expected to fetch between $12-$18M USD.(REUTERS/Tyrone Siu)
    REUTERS
  • A "Hutton-Mdivani Necklace," composed of 27 graduated jadeite beads of highly translucent bright emerald green colour, set the record for jadette jewelry and for a Cartier piece sold at auction. The imperial Chinese jade necklace modified with a ruby and diamond clasp by Cartier in the early 20th century sold for 214,040,000 HKD (about $27M USD) on April 7, 2014, in Hong Kong. (REUTERS/Tyrone Siu)
    2/10

    A "Hutton-Mdivani Necklace" is displayed during a preview ahead of Sotheby's Spring Sales in Hong Kong

    A "Hutton-Mdivani Necklace," composed of 27 graduated jadeite beads of highly translucent bright emerald green colour, set the record for jadette jewelry and for a Cartier piece sold at auction. The imperial Chinese jade necklace modified with a ruby and diamond clasp by Cartier in the early 20th century sold for 214,040,000 HKD (about $27M USD) on April 7, 2014, in Hong Kong. (REUTERS/Tyrone Siu)
    REUTERS
  • This vivid yellow 100.09 carats diamond (L), known as 'The Graff Vivid Yellow,' went on sale May 2014, and sold for a brilliant 14,501,000 CHF (about $15M USD). (REUTERS/Denis Balibouse)
    3/10

    A model poses with a vivid yellow 100.09 carats diamond and a 103.46 carats diamond ring during an auction preview at Sotheby's in Geneva

    This vivid yellow 100.09 carats diamond (L), known as 'The Graff Vivid Yellow,' went on sale May 2014, and sold for a brilliant 14,501,000 CHF (about $15M USD). (REUTERS/Denis Balibouse)
    Reuters
  • A 7.59 carat, internally flawless, fancy vivid blue diamond, The Premier Blue, is the world's largest round fancy blue diamond ever graded by the Gemological Institute of America. While it was expected to sell for as much as $19 million during a Hong Kong auction in October 2013, it failed to find a buyer. (REUTERS/Brendan McDermid)
    4/10

    A 7.59 carat, internally flawless, fancy vivid blue diamond is displayed at Sotheby's auction house in New York

    A 7.59 carat, internally flawless, fancy vivid blue diamond, The Premier Blue, is the world's largest round fancy blue diamond ever graded by the Gemological Institute of America. While it was expected to sell for as much as $19 million during a Hong Kong auction in October 2013, it failed to find a buyer. (REUTERS/Brendan McDermid)
    REUTERS
  • This 110.03 carat sun-drop diamond sold in 2011 in London, England. The diamond is the largest yellow pear-shaped diamond in the world, and sold for 11,282,500 (nearly $12M USD) (Photo by Dan Kitwood/Getty Images)
    5/10

    A Sun Drop Diamond Forms Part Of Sothebys Magnificent Jewels Sale

    This 110.03 carat sun-drop diamond sold in 2011 in London, England. The diamond is the largest yellow pear-shaped diamond in the world, and sold for 11,282,500 (nearly $12M USD) (Photo by Dan Kitwood/Getty Images)
    Getty Images
  • The Pink Star diamond sold for 76.3 million Swiss francs ($83.02M USD) in Geneva on November 13, 2013, a world record price for a gemstone at auction, Sotheby's said. (REUTERS/Tyrone Siu/Files)
    6/10

    A model poses with the Pink Star diamond during a press preview at Sotheby's in Hong Kong

    The Pink Star diamond sold for 76.3 million Swiss francs ($83.02M USD) in Geneva on November 13, 2013, a world record price for a gemstone at auction, Sotheby's said. (REUTERS/Tyrone Siu/Files)
    REUTERS
  • A 24.78 carat Fancy Intense Pink Diamond sold for 45,442,500 CHF (about $47M USD) at auction in October 2010. (Photo by Matthew Lloyd/Getty Images)
    7/10

    Sotheby's Showcase Some Of World's Finest Jewels Ahead Of Their Sale

    A 24.78 carat Fancy Intense Pink Diamond sold for 45,442,500 CHF (about $47M USD) at auction in October 2010. (Photo by Matthew Lloyd/Getty Images)
    Getty Images
  • This 118.28 carat, D colour, flawless, type IIA magnificent oval diamond, which was referred to at the time as "the greatest white diamond ever to appear at auction," sold for $238.7 million in Hong Kong dollars (approximately $30.6M USD) at a Sotheby's auction in Hong Kong in October 2013. (REUTERS/Bobby Yip)
    8/10

    A model poses with a 118.28 carat, D colour, flawless, type IIA magnificent oval diamond at a Sotheby's preview in Hong Kong

    This 118.28 carat, D colour, flawless, type IIA magnificent oval diamond, which was referred to at the time as "the greatest white diamond ever to appear at auction," sold for $238.7 million in Hong Kong dollars (approximately $30.6M USD) at a Sotheby's auction in Hong Kong in October 2013. (REUTERS/Bobby Yip)
    REUTERS
  • These Bulgari pear-shaped coloured diamond ear-pendants with a 6,95 carat Fancy Vivid Blue diamond next to a 6,79 carats Fancy Vivid Pink diamond were purchased by London luxury jeweller Laurence Graff, known as the "King of Diamonds" for CHF 15,500,000 (about $16M USD).
    9/10

    File picture of a Sotheby's staff member holding a Bulgari pear-shaped coloured diamond ear-pendants in Geneva

    These Bulgari pear-shaped coloured diamond ear-pendants with a 6,95 carat Fancy Vivid Blue diamond next to a 6,79 carats Fancy Vivid Pink diamond were purchased by London luxury jeweller Laurence Graff, known as the "King of Diamonds" for CHF 15,500,000 (about $16M USD).
    REUTERS
  • "The Blue Belle of Asia," a 392,52 carats Ceylon sapphire, fetched a record CHF 16,960,000 (US$ 17,600,000) in November 2014. (REUTERS/Denis Balibouse/Files)
    10/10

    File picture of a Sotheby's staff member wearing "The Blue Belle of Asia" in Geneva

    "The Blue Belle of Asia," a 392,52 carats Ceylon sapphire, fetched a record CHF 16,960,000 (US$ 17,600,000) in November 2014. (REUTERS/Denis Balibouse/Files)
    REUTERS
Displayed with the 100-carat diamond was "The Sunrise Ruby" (pictured on the right). The Cartier-mounted ring will go on sale in Geneva on May 12 and is expected to fetch between $12-$18M USD.(REUTERS/Tyrone Siu)
A "Hutton-Mdivani Necklace," composed of 27 graduated jadeite beads of highly translucent bright emerald green colour, set the record for jadette jewelry and for a Cartier piece sold at auction. The imperial Chinese jade necklace modified with a ruby and diamond clasp by Cartier in the early 20th century sold for 214,040,000 HKD (about $27M USD) on April 7, 2014, in Hong Kong. (REUTERS/Tyrone Siu)
This vivid yellow 100.09 carats diamond (L), known as 'The Graff Vivid Yellow,' went on sale May 2014, and sold for a brilliant 14,501,000 CHF (about $15M USD). (REUTERS/Denis Balibouse)
A 7.59 carat, internally flawless, fancy vivid blue diamond, The Premier Blue, is the world's largest round fancy blue diamond ever graded by the Gemological Institute of America. While it was expected to sell for as much as $19 million during a Hong Kong auction in October 2013, it failed to find a buyer. (REUTERS/Brendan McDermid)
This 110.03 carat sun-drop diamond sold in 2011 in London, England. The diamond is the largest yellow pear-shaped diamond in the world, and sold for 11,282,500 (nearly $12M USD) (Photo by Dan Kitwood/Getty Images)
The Pink Star diamond sold for 76.3 million Swiss francs ($83.02M USD) in Geneva on November 13, 2013, a world record price for a gemstone at auction, Sotheby's said. (REUTERS/Tyrone Siu/Files)
A 24.78 carat Fancy Intense Pink Diamond sold for 45,442,500 CHF (about $47M USD) at auction in October 2010. (Photo by Matthew Lloyd/Getty Images)
This 118.28 carat, D colour, flawless, type IIA magnificent oval diamond, which was referred to at the time as "the greatest white diamond ever to appear at auction," sold for $238.7 million in Hong Kong dollars (approximately $30.6M USD) at a Sotheby's auction in Hong Kong in October 2013. (REUTERS/Bobby Yip)
These Bulgari pear-shaped coloured diamond ear-pendants with a 6,95 carat Fancy Vivid Blue diamond next to a 6,79 carats Fancy Vivid Pink diamond were purchased by London luxury jeweller Laurence Graff, known as the "King of Diamonds" for CHF 15,500,000 (about $16M USD).
"The Blue Belle of Asia," a 392,52 carats Ceylon sapphire, fetched a record CHF 16,960,000 (US$ 17,600,000) in November 2014. (REUTERS/Denis Balibouse/Files)
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They say diamonds are a girl's best friend, and with some of these stones that have hit the auction block at Sotheby's, it'll be easy to get a whole lot of friends. Check out some of the gemstones that sold for huge amounts of money over the years.