Stuller Hires Guy Borenstein as Senior Gemologist
He has relocated from Israel to Louisiana to lead its gemological laboratory.

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.
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.”
The Latest

Was 2025 a good year for jewelers? Did lab-grown diamonds outsell natural? Find out on the first episode of the “My Next Question” podcast.

Whether you recognize their jewels or are just discovering them now, these designers’ talent and vision make them ones to watch this year.

Buyers are expected to gravitate toward gemstones that have a little something special, just like last year.

Criminals are using cell jammers to disable alarms, but new technology like JamAlert™ can stop them.

Plus, JSA’s Scott Guginsky discusses the need for jewelers to take more precautions as the gold price continues to climb.


Morris’ most cherished role was being a mother and grandmother, her family said.

“Vimini” is the first chapter of the “Bulgari Eternal” collection that merges archival pieces with modern creations.

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

The third edition will be held in Half Moon Bay, California, in April.

The grant is in its first year and was created to recognize an exceptional fine jewelry designer whose star is on the rise.

Data built on trust, not tracking, will be key to success going forward, as the era of “borrowed attention” ends, Emmanuel Raheb writes.

Heath Yarges brings two decades of experience to the role.

Pete’s boundless curiosity extended beyond diamond cut and he was always eager to share his knowledge with others, no matter the topic.

Cartier, Van Cleef & Arpels, Buccellati, and Vhernier had another successful holiday season, Richemont reported this week.

Our Piece of the Week is Lagos’ “Bee” brooch that was seen on the red carpet for the first time on Sunday.

Trevor Jonathan Wright led a crew in a string of armed robberies targeting South Asian-owned jewelry stores on the East Coast.

The program recognizes rising professionals in the jewelry industry.

A new lifestyle section and a watch showcase have been added to this year’s event.

Avocados From Mexico is celebrating those who love to double-dip in game day guacamole with a 14-karat yellow gold tortilla chip necklace.

Petra Diamonds unearthed the 41.82-carat, Type IIb blue diamond at the Cullinan Mine.

The brand is trading its colorful fabric cords for Italian leather in its “Lasso” baby locket bracelets.

National Jeweler and Jewelers of America’s popular webinar series is evolving in 2026.

The department store chain owes millions to creditors like David Yurman, Roberto Coin, Kering, and LVMH.

The award-winning actor’s visionary approach and creativity echo the spirit of Boucheron, the brand said.

Edge Retail Academy honored Burnell’s Fine Jewelry in Wichita, Kansas, with its annual award for business excellence.

In a market defined by more selective consumers, Sherry Smith shares why execution will be independent jewelers’ key to growth this year.

The family-owned jeweler’s new space is in a former wholesale produce market.
























