MajorsMay 17, 2021
Pandora’s Head of North America Steps DownGradingMay 26, 2021
Stuller Hires Guy Borenstein as Senior Gemologist
He has relocated from Israel to Louisiana to lead its gemological laboratory.
Industry veteran Guy Borenstein has been named senior gemologist at Stuller, leading the supplier’s gem lab.
Lafayette, La.—Industry veteran Guy Borenstein has joined Stuller’s team.
The supplier named him senior gemologist; he will be the lead gemological authority for the company.
Borenstein succeeds Mike Turner in the role, who passed away suddenly in December 2019.
He and his family have relocated from Israel to Lafayette, Louisiana, where Stuller is headquartered.
He started working there in early May, the company confirmed, where he leads the gemological laboratory, which sits alongside its in-house GIA Melee Analysis service lab and its team of diamond and gemstone experts.
Its lab contains advanced gemological equipment that allows them to screen for and detect undisclosed lab-grown diamonds.
Related stories will be right here …
The supplier named him senior gemologist; he will be the lead gemological authority for the company.
Borenstein succeeds Mike Turner in the role, who passed away suddenly in December 2019.
He and his family have relocated from Israel to Lafayette, Louisiana, where Stuller is headquartered.
He started working there in early May, the company confirmed, where he leads the gemological laboratory, which sits alongside its in-house GIA Melee Analysis service lab and its team of diamond and gemstone experts.
Its lab contains advanced gemological equipment that allows them to screen for and detect undisclosed lab-grown diamonds.
Borenstein’s role at Stuller will help the company comply with RJC Code of Practices and FTC rules regarding product integrity, a spokesperson for the company confirmed.
He joined Stuller with 15 years of experience in various gemological disciplines, including serving as the vice president of gemological services at Gemewizard and chief gemologist at EGC and GWLAB laboratories.
He is a Gemmological Association of Great Britain FGA and holds an EGG (E.G.L. Graduate Gemologist) diploma from the European Gemological College.
“Guy is a world-class talent, highly respected among leading gemologists, and we are fortunate to have him join the Stuller team,” said Stanley Zale, vice president of diamond and gemstone procurement at Stuller.
“He is a great addition to our team. His knowledge and skills will help us continue to lead the industry with robust programs that best ensure the integrity of our products.”
He joined Stuller with 15 years of experience in various gemological disciplines, including serving as the vice president of gemological services at Gemewizard and chief gemologist at EGC and GWLAB laboratories.
He is a Gemmological Association of Great Britain FGA and holds an EGG (E.G.L. Graduate Gemologist) diploma from the European Gemological College.
“Guy is a world-class talent, highly respected among leading gemologists, and we are fortunate to have him join the Stuller team,” said Stanley Zale, vice president of diamond and gemstone procurement at Stuller.
“He is a great addition to our team. His knowledge and skills will help us continue to lead the industry with robust programs that best ensure the integrity of our products.”
More on Grading
The Latest
AuctionsOct 24, 2025
Bonhams Under New Ownership, Top Executives ReplacedLondon-based investment firm Pemberton Asset Management acquired the auction house for an undisclosed amount.
CrimeOct 24, 2025
Video Emerges of Louvre Jewelry Robbers Fleeing the Scene The footage shows two of the jewelry heist suspects descending from the second floor of the museum and then escaping via scooter.
CollectionsOct 24, 2025
Piece of the Week: Wyld Box Jewelry’s ‘Ray of Light’ EarringsFounder and designer Rosanna Fiedler looked to a vintage Cartier clutch when designing the sunlight-inspired drop earrings.
Brought to you by
Are Earrings an Overlooked Category? What Retailers Need to Know NowAs the holiday season quickly approaches, consider stocking one category that sometimes gets overlooked: earrings.
FinancialsOct 23, 2025
Jewelry Sales Resilient Despite Struggles at LVMH, KeringThe luxury conglomerates faced a challenging Q3 amid geopolitical and economic tensions.
Weekly QuizOct 16, 2025
This Week’s QuizTest your jewelry news knowledge by answering these questions.
SourcingOct 23, 2025
Petra Diamonds Turns to Shareholders to Raise Capital The struggling diamond mining company, which owns the historic Cullinan mine, has launched a rights issue to raise about $25 million.
WatchesOct 23, 2025
‘Million Dollar Hip Hop Watches’ Recounts Watch HistoryThe book details the journey of watches as symbols of hard-earned success in hip-hop for artists like 2Pac, Jay-Z, and more.
Brought to you by
Protect Your Customers and Your BusinessYou deserve to know what you are selling–to protect your customers as well as your business and your reputation.
AuctionsOct 23, 2025
Freeman’s | Hindman Names New VP, Senior Specialist for Jewelry & WatchesAlexis Vourvoulis, who most recently worked at Tiffany & Co., brings more than two decades of jewelry experience to her new role.
TrendsOct 22, 2025
The Taylor Swift Effect: Antique Diamonds EditionThe superstar’s August engagement put the stamp of approval on an already hot engagement ring trend.
TrendsOct 22, 2025
Don’t Forget These Diamond Jewelry Trends When Stocking for the HolidaysRetailers should offer classic styles with a twist that are a perfect fit for layered looks, experts say.
AuctionsOct 22, 2025
Pink Diamond, Vanderbilt Jewels to Headline Phillips’ Geneva AuctionThe nearly 7-carat fancy vivid purplish pink diamond could sell for around $9 million.
SourcingOct 22, 2025
In ‘Storied Diamond,’ Jared Jewelers Is Emphasizing the Journey The retailer’s new collection of engagement rings and fashion jewelry is set with natural diamonds that are traceable via blockchain.
CollectionsOct 22, 2025
Tiffany & Co.’s ‘Bird on a Rock’ Finds New PerchChief Artistic Officer Nathalie Verdeille has reimagined the iconic design in both figurative and abstract creations.
Events & AwardsOct 22, 2025
JFC Kicks Off Halloween Costume ChallengeFive dollars buys one vote toward an industry professional you want to see dressed up as a hero, or a villain, this Halloween.
Events & AwardsOct 22, 2025
Hillsborough Antique Show Gets New OwnerRecently acquired by KIL Promotions, the November edition of the public show in San Mateo, California, will be held Nov. 7-9.
MajorsOct 21, 2025
Pomellato Brings ‘Global Attitude’ to Rodeo Drive FlagshipHollywood glamour meets Milanese sophistication in the design of Pomellato’s new store in Beverly Hills, California.
Lab-GrownOct 21, 2025
Grown Brilliance Opens First FlagshipThe New York City store showcases a chandelier with 1,500 carats of lab-grown diamonds designed by an FIT student.
Events & AwardsOct 21, 2025
‘Douriean Fletcher: Jewelry of the Afrofuture’ Opens at MADThe Museum of Arts and Design's new exhibition features 75 pieces by the designer, best known for her work in the “Black Panther” films.
AuctionsOct 20, 2025
Sotheby's To Auction 10-Carat Vivid Pink DiamondMaking its auction debut, "The Glowing Rose" is expected to fetch $20 million at the November jewelry sale in Geneva.
SourcingOct 20, 2025
2 Mozambique Police Officers Killed at Gemfields’ Ruby MineThey were attacked on Oct. 15, as approximately 40 miners without licenses marched on the mine’s gate.
CrimeOct 20, 2025
See the ‘Priceless’ Jewels Stolen During Daytime Heist at the Louvre It took the masked thieves less than 10 minutes to steal eight irreplaceable jewels from two display cases in the museum’s Apollo Gallery.
SourcingOct 20, 2025
Pristine Gems Names New Director of European SalesGemologist Lauren Gayda has previously worked at The Clear Cut, Taylor & Hart, and Effy Jewelry.
IndependentsOct 17, 2025
From the Jazz Age to the Information Age: London Jewelers Turns 100In 2026, the jewelry retailer will celebrate a milestone only a small percentage of family-owned businesses survive to see.
Events & AwardsOct 17, 2025
An Edit of Italian Jewels Is Coming to NYCThe new showcase dedicated to Italian jewelry design is set for Oct. 29-30.
TrendsOct 17, 2025
Piece of the Week: Judi Powers Jewelry’s ‘Stella’ EarringsTake a gaze at the sky with this pair of platinum diamond-set star earrings with blue lace agate drops.
IndependentsOct 16, 2025
Retailer Hall of Fame 2025: Jeffrey Zimmer Jeffrey Zimmer's decades of leadership at Reeds Jewelers are defined by integrity, a love of sourcing gemstones, and a heart for community.
