If you’ve visited our London office, chances are you’ve already met Tamara- our office manager and go-to for bespoke pieces. We sat down with her to talk about her journey from admin team to office manager, how she helps clients bring their dream jewellery pieces to life and what she loves about working here.

We now carry a range of lab grown diamonds — but always with full transparency. In this Q&A, we give more details about our lab grown stock and answer some of the most common trade questions.

A closer look at why second-hand diamond jewellery continues to hold appeal: from better margins and customer value to sustainable sourcing and more.

A straightforward breakdown of how the second-hand margin scheme affects pricing, markups, and VAT in the jewellery trade—written with jewellers in mind.

Despite price shifts and growing competition from lab-grown stones, natural diamonds remain a prized choice. This article explores market changes, new grading standards, and why naturals continue to hold their special place—offering key insights for your business.

Need an opinion or expert evaluation on a piece of second-hand diamond jewellery? Meet Jonathan Weissbart — partner at S Weissbart and passionate marathon runner — the person you’ll want to speak with. Anyone who’s had the pleasure of meeting Jonathan at our London office will tell you the same thing: from the moment you sit down with him, you feel at ease, as if catching up with an old friend.

If you’ve ever visited our London office, there’s a good chance you’ve met David Weissbart. Partner owner of S Weissbart, David is a true wellspring of diamond expertise—always generous with his knowledge and happy to offer guidance to those new to the industry. Following in his father’s footsteps, he’s approachable, customer-focused and passionate about upholding the values that have shaped the business.

At S Weissbart, we believe sourcing diamonds responsibly means more than just Cut, Colour, Clarity, and Carat. As an RJC-certified, second-generation diamond dealer, we add two more Cs: Certification and Confidence. Built on trust and transparency, we’re committed to ethical sourcing and long-term client relationships—so you can trade with confidence at every step.