101-ct Allnatt Yellow Diamond Could Fetch $7.2m

The 101.29-carat Allnatt diamond, described as one of the world’s most significant fancy vivid yellow stones, is to be auctioned at Sotheby’s Geneva, with an estimate of $6.2m to $7.2m.

The Type 1a gem, from South Africa, was named after the British racehorse owner and art collector Major Alfred Ernest Allnatt, who bought in in the 1950s. He had it mounted in a brooch by Cartier.

The Allnatt forms the heart of a flowerhead composed of openwork, brilliant-cut diamond-set petals enhanced with baguette diamonds.

It was last offered at auction in Geneva in May 1996 – as the ‘Property of a Lady’ – and sold for just over $3m. At the time it weighed 102.07 carats and was graded fancy intense yellow by the GIA.

It was subsequently repolished to its current 101.29 carats, which bought the color up to fancy vivid yellow.

The Allnatt diamond leads the Magnificent Jewels and Noble Jewels sale on May 14.

Source: IDEX

Yellow Diamond Ring to Lead Bonhams Sale

A 10.19-carat yellow diamond ring will lead an upcoming auction at Bonhams in London, where it is set to fetch up to GBP 160,000 (approximately $199,300).

Bonhams will offer the radiant-cut, fancy-intense-yellow, VS1-clarity stone, set between shield-cut diamond shoulders, at its December 7 London Jewels auction, it said Tuesday.

Two additional yellow diamonds for sale include a brilliant-cut, 10.02-carat, fancy-yellow diamond single-stone ring and a step-cut, 8.45-carat, fancy-yellow diamond ring accented by four pear-shaped diamonds set between baguette and step-cut diamond shoulders. Both pieces carry estimates of GBP 50,000 to GBP 70,000 (approximately $62,300 to $87,200).

The 149-lot auction will also feature pieces from multiple single-owner private collections, spanning from 1870 to the modern day. These comprise jewels from Cartier, Bulgari, Graff, Moussaieff, Van Cleef & Arpels, Harry Winston, Boucheron, Tiffany & Co., David Webb, and Grima.

Highlights from a single-owner private European collection are a Lalique Art Nouveau enamel, pâte-de-verre, sapphire and diamond pendant from around 1905 to 1915; a Cartier Panthère coral, emerald, onyx and diamond brooch, circa 1968; and a Cartier ruby and diamond clip and ear clip suite brooch combination that dates to about 1960.

Another collection, from a descendant of Dorothy Maud, Countess Haig, boasts a pearl and diamond tiara necklace presented to the countess by Queen Alexandra in 1905 on her marriage to General Haig.

Source: Diamonds.net

ALROSA Uncovers Largest Yellow Diamond Find So Far This Year

Alrosa Yellow Diamond

ALROSA subsidiary JSC Almazy Anabara has recovered a 28.59 carat rough diamond of deep greenish yellow hue the biggest yellow found so far this year.

ALROSA said that following an appraisal, the color of the stone has been determined as fancy intense yellow.

The diamond, discovered at Ebelyakh placer deposit in July, has dimensions of 11.40 x 19.00 x 17.50 mm, and has “insignificant colorless inclusions on the surface,” the miner said.

“This stone is unique because nature seemed to have prepared it for cutting in advance and gave it a pear-like shape,” said Evgeny Agureev, a Member of the Executive committee, and Director of the United Selling Organization of ALROSA.

The United Selling Organization and the company’s cutting division, DIAMONDS ALROSA, have yet to study the diamond and decide whether to auction it as a rough stone or to cut and polished it.

The Almazy Anabara is a leader in producing fancy colored stones. In 2017, it produced a 27.85 carat pure pink diamond the largest pink stone in ALROSA’s history, and a large 34.17 carat vivid yellow diamond.

ALROSA plans to focus its cutting division on the processing of large and colored diamonds and the subsequent sales. Starting this year, ALROSA has been sorting colored diamonds according to a new technology, that includes almost all hues and color grades. Most of these diamonds are processed by DIAMONDS ALROSA the company’s polished diamond unit.

ALROSA produces at least 7,000 carats of colored diamonds per year. In September, it held a True Colors auction in Hong Kong, where it showcased a collection of 250 diamonds of different shapes and hues. The company said it plans to run such auctions regularly.

Source: IDEX