Biggest diamond ever to be sold fetches £25 million at auction

A necklace known as Creation I featuring a 163.41 carat D Colour Flawless diamond and created by Swiss jewellers de GRISOGONO

A necklace known as Creation I featuring a 163.41 carat D Colour Flawless diamond and created by Swiss jewellers de GRISOGONO

Geneva: The largest diamond ever offered at auction is set to go under the hammer in Geneva Tuesday evening, with bids expected to top $25 million. Lucapa, the Australian diamond company which mined the stone, says that the diamond originally measured over seven centimetres in length, which makes it the largest diamond ever discovered in Angola.

The diamond was first taken from a 404-carat stone that was found in the African nation of Angola a year ago.

Set in an emerald and diamond necklace, the massive gem had been on tour to Hong Kong, London, Dubai and NY. D, according to gemologists, is the highest colour grade given to diamonds and indicates that the precious stone is absolutely colourless and therefore rare.

The rough was analysed in Antwerp and cut in NY, where a team of 10 diamond-cutting specialists were involved in mapping, plotting, cleaving, laser-cutting and polishing the giant rough rock into a polished, flawless diamond.

Diamond cleaver Ben Green analysed the gem for months and eventually started working on splitting the rough diamond in two in June previous year.


Founder Fawaz Gruosi described the gem as "the most lovely diamond in the world". The finished piece of jewellery comprises white gold, diamond and emeralds and has been designed by Swiss jewellery maker de Grisogono.

Mr Gruosi added: "I never thought I would work with a 163.41 carat diamond of this quality".

"I couldn't do something very simple or that has already been seen".

The flawless 163-carat clear diamond, the centrepiece of an asymmetric gem-studded necklace, was the largest of its kind ever auctioned.

The stone can be detached from the necklace and attached to other jewellery.

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