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One of only three Oval Diamonds over 50 Carats to appear at Auction in Living Memory

Prized by kings and queens for centuries and across civilisations, coveted by tycoons and moguls of the 20th century, exceptional large diamonds have become the ultimate collectibles for modern day connoisseurs. This spring, a spectacular 88.22-carat, D Colour, Flawless, Type IIa, oval brilliant diamond, perfect according to every critical criterion, will lead Sotheby’s Hong Kong Sale of Magnificent Jewels and Jadeite on 2 April 2019 (est. HK$88 - 100 million / US$11.2 - 12.7 million).

This is one of only three oval diamonds of over 50 carats to appear at auction in living memory, and the largest to be auctioned in over five years

Perfect according to every critical criterion, the diamond has achieved the highest rankings under each of the standards by which the quality of a stone is judged (‘the four Cs’). The diamond is D colour (the highest grade for a white diamond); of exceptional clarity (it is completely flawless, both internally and externally), and has excellent polish and symmetry.

As with the Koh-i-noor diamond (also oval) and the Cullinan I, which are part of the British Crown Jewels, the stone belongs to the rare subgroup comprising less than 2% of all gem diamonds, known as Type IIa*. Diamonds in this group are the most chemically pure type of diamond and often have exceptional optical transparency.

Finding a rough diamond that allows the cutter to fashion a stone of over 80 carats is a true and very rare discovery. The 242-carat rough stone which yielded the diamond was discovered in Botswana in the mine of Jwaneng, a mine owned in partnership by De Beers and the government of Botswana and known for producing roughs of the highest quality.

Following its discovery, the rough was cut and polished over a period of intense months to produce a symmetrical and striking oval brilliant diamond. Given the elongated shape of the rough the oval shape was chosen to preserve the greatest amount of weight. Great skill and precision was needed to cut a stone of this importance - a level of expertise and craftsmanship possessed by only a small handful of cutters in the world

Sotheby's 102.34-carat white diamond

Sotheby’s has been at the forefront of selling notable white diamonds of impressive size and superb quality. The appearance of the 88.22-carat diamond follows a series of landmark sales for ultra-rare white diamonds last year. In April 2018, a private collector acquired - through Sotheby’s Diamonds, a retail boutique specialising in the world’s finest diamonds - an extraordinarily rare 102.34-carat white diamond - the only known round brilliant diamond over 100 carats to have achieved perfection by all critical criteria: colour, clarity, cut & carat

A month later, in a Geneva auction, two highly impressive white diamonds, also D Colour Flawless and Type IIa - a 51.71-carat round diamond and a 50.39-carat oval diamond - sold above their high estimate for US$9.3 million and US$8.1 million respectively.

The stone will lead Sotheby’s Hong Kong Sale of Magnificent Jewels and Jadeite

on 2 April 2019

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