Marc Jacheet Leaves Role as CEO of De Beers Brands
Sandrine Conseiller, CEO of French footwear and apparel company Aigle, has been hired to replace him.

De Beers Group announced his exit Thursday. He will be replaced by Sandrine Conseiller, who has spent the last eight years at Maus Freres Brands Group, which owns Lacoste and The Kooples brands, among others.
She will join the company Dec. 1, overseeing the company’s brands, including De Beers Jewellers and Forevermark, and investment in existing and new diamond markets.
Most recently, Conseiller was CEO of footwear and apparel company Aigle, a Maus Freres brand.
Before that, she worked as group marketing and branding executive vice president for Lacoste.
Prior to her time at Maus Freres, she spent almost two decades in leadership roles at Unilever in marketing, general management, and auditing.
Conseiller holds a master’s degree in business management from NEOMA Business School in France and has an International Directors Programme certificate from INSEAD.
She has served as a board member and senior advisor at PPYarns, Carbios, and Raise Sherpas. She also received the Chevalière de l’Ordre National du Mérite (Knight of the French Republic) for her work promoting diversity and sustainability in business.
“I’m delighted to welcome Sandrine to De Beers. Her track record as a leader of iconic, purpose-led brands speaks for itself. She has consistently driven transformation and growth. But I am even more impressed by her passion and values,” De Beers Group CEO Al Cook said.
“Sandrine joins De Beers at an exciting time, as we grow the value of our 135-year old brand and share magnificent diamond jewelry with our clients around the world. I look forward to working with her.”
Jacheet, a former Tiffany & Co. executive, joined De Beers in April 2022 after the retirement of company veteran Stephen Lussier, who spent 37 years with De Beers.
At the time of his retirement, Lussier’s title was executive vice president of brands and consumer markets, but Jacheet joined the company as CEO of De Beers Brands, a new title at the time.
De Beers said he has left the company to “pursue other opportunities.”
Cook said, “I would like to thank Marc for his support and contribution during his time as CEO of De Beers brands and wish him great success in the future.”
The Latest

The retailer offered more fashion jewelry priced under $1,000, including lab-grown diamond and men’s jewelry.

The eau de parfum is held in a fluted glass bottle that mirrors the decor of the brand’s atelier, and its cap is a nod to its “Sloan” ring.

In addition, a slate of new officers and trustees were appointed to the board.

How Jewelers of America’s 20 Under 40 are leading to ensure a brighter future for the jewelry industry.

Witt’s Jewelry in Wayne, Nebraska, is the organization’s new milestone member.


The man, who has a criminal history, is suspected of being the fourth member of the four-man crew that carried out the heist.

The single-owner collection includes one of the largest offerings of Verdura jewels ever to appear at auction, said Christie’s.

Roseco’s 704-page catalog showcases new lab-grown diamonds, findings, tools & more—available in print or interactive digital editions.

Michael Helfer has taken the reins, bringing together two historic Chicago jewelry names.

The guide features all-new platinum designs for the holiday season by brands like Harwell Godfrey, Ritani, and Suna.

During its Q3 call, CEO Efraim Grinberg discussed the deal to lower tariffs on Swiss-made watches, watch market trends, and more.

Rosior’s high jewelry cocktail ring with orange sapphires and green diamonds is the perfect Thanksgiving accessory.

The “Embrace Your True Colors” campaign features jewels with a vibrant color palette and poetry by Grammy-nominated artist Aja Monet.

Luxury veteran Alejandro Cuellar has stepped into the role at the Italian fine jewelry brand.

The company gave awards to four students at the Namibia University of Science & Technology, including one who is a Grandview Klein employee.

She is remembered as an artist who loved her craft and was devoted to her faith, her friends, and her family.

It joins the company’s other manufacturing facilities globally, including in India, Botswana, and Namibia.

The polka dot pattern transcends time and has re-emerged as a trend in jewelry through round-shaped gemstones.

Vanessa Hickman, 49, allegedly sold a diamond bracelet that was mistakenly sent to her home.

GIA’s former president and CEO was presented with the Richard T. Liddicoat Award for Distinguished Achievement.

Social media experts spoke about protecting brand reputation through behaving mindfully online.

In 2026, the three will come together as “House of Brands,” with Gallet sold in Breitling stores and Universal Genève sold separately.

The second drop, which includes more Elphaba-inspired pieces from additional designers, will continue to benefit nonprofit Dreams of Hope.

Second-generation jeweler Sean Dunn has taken on the role.

Amber Pepper’s main focus will be on digital innovation and engaging younger consumers.

Called “Origin by De Beers Group,” the loose, polished diamonds are being sold in a total of 30 stores in the United States and Canada.

The lariat necklace features a 4.88-carat oval-cut Zambian emerald in 18-karat yellow gold.






















