World's most expensive Diamonds

The Chloe Diamond is a brilliant-cut diamond, weighing 84.37 carats, bought by Georges Marciano, the founder of clothing company Guess Inc. Marciano named the stone “the Chloe Diamond” after his then 12-year-old daughter. The diamond sold for $16.2 Million at Sotheby's Geneva in 2007.

In November 2012, Christie's sold the cushion-shaped, colourless, 76.02-carat Archduke Joseph Diamond for $21.5 million.

A 14.23 carat diamond, named The Perfect Pink, sold for $23,165,968 in November 2010 to an anonymous buyer after an intense bidding war with four others. Christie's says only 18 diamonds bigger than 10 carats and showing a distinct pure pink colour have ever gone on the block in 244 years of auction history.

The Wittelsbach-Graff Diamond is a cushion-cut fancy deep grayish blue diamond weighing 35.56 carats. It sold at auction in December 2008 for $24.3m The diamond originates from the Indian kingdom of Golkonda. It's rumored that King Philip IV of Spain purchased the jewel and included it in the dowry of his teenage daughter, Margaret Teresa, in 1664.

	On 15 May 2013 Christie’s auctioned the "Winston Legacy" in Geneva for $ 26.7m. A pear-shaped perfect diamond weighing 101.73 carats, 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 rough stone weighed 236 carats when it was extracted from the Jwaneng mine (DeBeers) in Botswana and required 21 months to polish.
	The Orange - Christie’s Geneva sold the largest fancy vivid orange diamond ever offered at auction, weighing 14.82 carats, for a record $35.5m or $2.4 million per carat. The sale set a world record price per carat for any diamond sold at auction, as well as a world record price for an orange diamond. It is the 4rd most expensive diamond ever sold at auction. Christie's said: “Time and again, a stone will appear on the market that is truly a miracle of nature. The 14.82-carat orange diamond is one such a stone, a rare gem, which will perhaps only be seen once in a lifetime.

The Princie Pink is a cushion-cut 34.65 carats and is one of the finest and largest of its kind. The stone can be traced back to the ancient diamond mines of India. The diamond was sold at auction in 1960 where it brought a price of 46,000 pounds sterling (approximately $69,588 in today's currency). The stone sold for $ 39m in April, 2013.

The Graff Pink is a vivid pink, round-cornered rectangular step-cut diamond weighing 24.78 carats, set between shield-shaped diamond shoulders, in platinum. It sold on November 10, 2010 for $ 46.2m

The 59.6-carat Pink Star diamond lived up to its hype by selling for a world record price of approximately $83.4 million at Sotheby’s Geneva Magnificent Jewels sale Wednesday. When introducing the internally flawless fancy pink vivid diamond, David Bennett, chairman of Sotheby’s Jewellery Division in Europe and the Middle East, called it “one of the most remarkable gems to ever appear at auction.”

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Sotheby's David Bennett says the diamond belongs in "the ranks of the earth's greatest natural treasures." He said "it was very rare to have vivid pink diamonds weighing only five carats, this 59.60 carat stone is simply off any scale." It is over twice the size of the 24.78-carat "Graff Pink" diamond that set the world auction record for $46.2m. The gem, which was mined by De Beers in Africa in 1999, has received the highest possible colour and clarity rating from the Gemological Institute of America (GIA). It weighed 132.5 carats in the rough, and was cut and polished over a period of two years by Steinmetz Diamonds.