DiamondBuzz
Rare Pink Diamond Ring Expected to Fetch $9M at Phillips Geneva Auction

A rare fancy vivid purplish-pink diamond ring is expected to lead Phillips’ Geneva Jewels Auction: V on November 10, with an estimated value of around $9 million, the auction house announced last week.
The centerpiece of the ring is a 6.95-carat, VVS2-clarity, type IIa pink diamond, flanked by two triangular white diamonds. Its vivid color and exceptional clarity place it among the most coveted stones in the world of high jewelry.
The Geneva auction will also feature a selection of prestigious pieces, including jewels from the Vanderbilt family collection, and signature creations by top luxury houses such as Van Cleef & Arpels, Cartier, Bulgari, and Graff.
Ahead of the sale, Phillips will tour highlights from the collection across major cities including New York, Singapore, Taipei, and London, before presenting the full auction in Geneva.

This ring features a step-cut, 18.09-carat Kashmir sapphire with diamond shoulders. It has an upper estimate of CHF 2.2 million ($2.8 million).

A pair of earrings consisting of brilliant-cut, D-color, VVS1-clarity diamond studs weighing 8.28 and 8 carats will go on the block for up to CHF 680,000 ($850,000).

Phillips will offer this ring, bearing an old-cut, 10.08-carat, light-brown-pink, type IIa Golconda diamond. It’s expected to fetch up to CHF 520,000 ($650,000).

Schlumberger created this necklace in the 1950s. The piece, which includes diamonds, rubies, and sapphires, has a high price of CHF 400,000 ($500,000).

A pair of Graff earrings with octagonal step-cut, fancy-yellow diamond center stones weighing 21.38 and 20.33 carats surrounded by diamonds is estimated at up to CHF 400,000 ($500,000).

This diamond sautoir that Van Cleef & Arpels made in the 1920s has a step-cut diamond weighing 10.79 carats. The lot carries an upper price of CHF 400,000 ($500,000).

A ring with a 4.95-carat Burmese ruby and diamonds has a top estimate of CHF 320,000 ($400,000).

A convertible piece, this lot can be worn as a tiara or a necklace. Created in the second half of the 19th century, it has sapphires and diamonds, and carries a high estimate of CHF 320,000 ($400,000).

Bearing a 20.08-carat Paraiba tourmaline center stone in a diamond surround, this ring is anticipated to go for up to CHF 280,000 ($350,000).

DiamondBuzz
De Beers Group Announces Departure of Chief Trade and Industry Officer, Feriel Zerouki

De Beers Group today announced that Feriel Zerouki, Chief Trade and Industry Officer and member of the Executive Committee, has decided to leave the company at the end of October 2025.
Feriel joined De Beers in 2005 and has played a central role in shaping the company’s leadership in ethics, provenance and industry integrity. She led the launch of Tracr and GemFair, two major initiatives that advanced traceability and responsible sourcing in the diamond industry, strengthening consumer confidence and setting new benchmarks for transparency and sustainability.
Beyond her work at De Beers, Feriel has led efforts to enhance the Kimberley Process and improve transparency in mining-origin certification as President of the World Diamond Council, a role she will continue until the end of May 2026.

Al Cook, CEO of De Beers Group, said: “Feriel has played a pivotal role in establishing and upholding the highest standards of integrity and provenance within De Beers and across the global diamond industry. Her strategic insight and leadership have contributed meaningfully to initiatives that will leave a lasting impact on the sector. We thank her for her contributions and wish her continued success as she embarks on the next chapter of her career.”
Reflecting on her time at De Beers, Feriel Zerouki, said: “Being part of De Beers has been an extraordinary journey. I am immensely proud of what we have built together, and deeply grateful for the people and partnerships that have defined these twenty years. I leave with pride in our shared achievements and with excitement for what lies ahead.”

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