 | On 15 May 2013 Christie’s will auction in Geneva a pear-shaped perfect diamond weighing 101.73 carats. Offered for sale for the first time, this sensational gemstone is not only one of the largest pear-shaped diamonds known to date, it is also one of the world’s most perfect diamonds: a D colour, Type IIA Flawless gem. The rare brilliance and inner limpidity is only found in the chemically pure Type IIA diamonds, which account for less than 2% of the world’s diamond production. Christie's said the rough stone weighed 236 carats when it was extracted from the Jwaneng mine (DeBeers) in Botswana and required 21 months to polish. |  |
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 | In November 2012, Christie's sold the cushion-shaped, colourless, 76.02-carat Archduke Joseph Diamond for a world record-setting $21.5 million. |  |  |
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