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Thu 10 Nov 2016 01:12 PM

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In pictures: Preview by Sotheby's auction house in Geneva

'The Sky Blue Diamond' weighing 8.01 carats, and a pre-sale estimate of US $15-25 million, will be offered at a Magnificent Jewels & Noble Jewels auction in Geneva.

In pictures: Preview by Sotheby's auction house in Geneva
A model presents the 'The Sky Blue Diamond,' a fancy, vivid blue diamond ring created by Cartier, during a press preview by Sotheby's Auction House on November 9, 2016 in Geneva. 'The Sky Blue Diamond' weighing 8.01 carats will be offered at a 'Magnificent jewels & noble jewels auction' in Geneva on November 16, 2016 with a pre-sale estimate of US $15-25 million. (Fabrice Coffrini/AFP/Getty Images)
In pictures: Preview by Sotheby's auction house in Geneva
A model poses with a parure of antique coloured diamond jewels during a press preview by Sotheby's auction house on November 9, 2016 in Geneva. The historical necklace part of a gift by Empress Catherine II, known as Catherine the Great (1729-1796), will be offered at a 'Magnificent jewels & noble jewels auction' in Geneva on November 16, 2016 with a pre-sale estimate of US $3-5 million. (Fabrice Coffrini/AFP/Getty Images)
In pictures: Preview by Sotheby's auction house in Geneva
A model poses with a diamond necklace with a stunning and delicate bowknot clasp during a press preview by Sotheby's auction house on November 9, 2016 in Geneva. The historical necklace commissioned as two separate pieces by Empress Catherine II, known as Catherine the Great (1729-1796) will be offered at a 'Magnificent jewels & noble jewels auction' in Geneva on November 16, 2016 with a pre-sale estimate of US $3-5 million. (Fabrice Coffrini/AFP/Getty Images)
In pictures: Preview by Sotheby's auction house in Geneva
A model presents the 'The Sky Blue Diamond,' a fancy, vivid blue diamond ring created by Cartier, during a press preview by Sotheby's Auction House on November 9, 2016 in Geneva. 'The Sky Blue Diamond' weighing 8.01 carats will be offered at a 'Magnificent jewels & noble jewels auction' in Geneva on November 16, 2016 with a pre-sale estimate of US $15-25 million. (Fabrice Coffrini/AFP/Getty Images)
In pictures: Preview by Sotheby's auction house in Geneva
A model poses with a diamond necklace with a stunning and delicate bowknot clasp during a press preview by Sotheby's auction house on November 9, 2016 in Geneva. The historical necklace commissioned as two separate pieces by Empress Catherine II, known as Catherine the Great (1729 1796) will be offered at a 'Magnificent jewels & noble jewels auction' in Geneva on November 16, 2016 with a pre-sale estimate of US $3-5 million. (Fabrice Coffrini/AFP/Getty Images)