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NEXT EVENT: Leen Heyne: Gems & Cocktails in San Francisco on December 4-5th, 2021

This show will feature a collaboration with Dutch master goldsmith Leen Heyne.

The collaboration is represented by one-of-a-kind rings made by Leen's hands, including the ring below with a 5.12 carat champagne diamond from Poli Trading Company.

Extraordinary diamond & gems from Poli Trading Co., B&B Gems and Esmeralda Gems will be available for viewing and custom design.

Enjoy a COVID-safe, private viewing experience in a relaxed environment in San Francisco. We will have champagne and cocktails, antique & vintage diamonds, rare Colombian emerald and colored gemstones.

A curated selection of finished Thesis jewels will be available, as well as select fine antique jewelry. Please get in touch for an appointment at  (+1-510-556-6443), or email

Invest in jewelry that you believe in

Philanthropy is at our core. We donate to The Sierra Club, WIRES Wildlife Rescue, Partners in Health, Doctors Without Borders, No Kid Hungry, Better Without Mercury, Mercury Free Mining, Amazon Aid, Navajo Nation Health, among other organizations. 

Let jewelry symbolize something powerful for you

We wish you a year of love- not only for others but also for yourself. Express gratitude for what you've learned. We invite you to celebrate your failures as opportunities for growth, and to honor your understanding. Choose jewelry for yourself this year.