RAPAPORT… Stuller, a provider of goods and services for jewelry professionals, has named Guy Borenstein as its senior gemologist.
Borenstein has 15 years of gemology experience under his belt, including stints as vice president of gemological services at Gemewizard, and as chief gemologist at the European Gemological Center and at GWLAB laboratories, an independent chain of labs.
“Guy is a world-class talent, highly respected among leading gemologists,” Stanley Zale, Stuller’s vice president for diamond and gemstone procurement, said Monday.
Stuller was founded more than half a century ago. Its core product categories include bridal jewelry, wedding bands, and fine jewelry.
Image: Guy Borenstein. (Stuller)
Stuller Appoints Head of Gemological Lab
The Bottom Line
- Guy Borenstein joins Stuller as senior gemologist, bringing 15 years of industry experience.
- Borenstein previously held leadership roles at Gemewizard, European Gemological Center, and GWLAB laboratories.
- Stuller focuses on bridal, wedding band, and fine jewelry markets, leveraging Borenstein's expertise.
Summary by Rapaport AI
More Stories

Podcast: The Importance of Origin
Antwerp’s Paul Chieveley-Williams discusses fancy-color diamonds.

Lab-Grown Organization Strikes Back at CIBJO
Diamond Producers Council threatens action against jewelers who “deceptively use the term synthetic.”

GIA Analyzes Atypical Color Center in Natural Diamond
5.22-carat, pinkish-brown stone displays unusual absorption features.
