The centerpiece of the forthcoming Magnificent Jewels sale in Geneva is an important and rare fancy vivid blue, internally flawless, cushion-shaped diamond weighing 7.03 carats (pictured left), cut from a 26.58 carat rough discovered in 2008 at Petra Diamonds’ historic Cullinan diamond mine in South Africa.
The buyer will have the honour of naming the diamond (est. CHF 6.8-10 million / $5.8-8.5 million). At a weight of 7.03 carats, the stone ranks among the most important blue diamonds ever to be offered for sale by Sotheby’s.
The Gemological Institute of America (GIA) has graded it as fancy vivid blue in colour and internally flawless in clarity, the highest possible grading for a blue diamond.
Blue diamonds, which are among the rarest of all gems, owe their colour to the presence of the
chemical element boron during the stone’s formation. The Cullinan mine is the world’s most consistently reliable source of blue diamonds and this stone is a perfect example of Cullinan diamonds at their best.
Source: Press Release http://sothebys.com
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