DiamondBuzz
RJC introduces regulations for LGD segment
The Responsible Jewellery Council (RJC) has issued a comprehensive set of regulations on the ethical, social, human rights and environmental aspects of lab grown diamonds for its 2,000-plus members.v The 33-page document establishes responsible business practices throughout the jewelry and watch supply chain
Its Laboratory Grown Materials (LGMS) 2025 standard is a set of 28 provisions – from legal compliance, working hours and forced labor to health and safety, hazardous substances and grading analysis.
RJC members, among them De Beers, Lucara, Signet Jewellers, Leo Schachter, Cartier and Harry Winston, must have their facilities certified as compliant by the RJC within a year if they handle lab growns. Non-members are encouraged to use the LGMS to improve their business practices.
LGMS certification provides a strong system for assuring stakeholders, shareholders, customers and business partners that a company conducts its business responsibly says the London-based RJC
DiamondBuzz
Motorsport Meets High Jewellery: Hannah St John Turns Heads with ‘La Velocita’ Diamond Necklace at F1 Event
A 25-carat, 1,800-diamond Masterpiece Inspired by Formula 1 circuits Takes Centre Stage at the Glamour on the Grid ahead of the Australian Grand Prix
At the glamorous lead-up to the Australian Grand Prix, Hannah St John, partner of Liam Lawson, made a striking statement at the Glamour on the Grid event with a one-of-a-kind diamond necklace that seamlessly blended motorsport and haute jewellery.
Titled “La Velocit” (The Speed), the necklace was crafted by Australian atelier Martin Rogers Jewellery. The extraordinary piece features approximately 1,800 diamonds totalling 25 carats, intricately arranged to trace the outlines of iconic Formula 1 circuits from the global racing calendar.



A true testament to craftsmanship, the necklace required an estimated 250–300 hours of meticulous handwork, including weeks dedicated solely to precision diamond setting. Valued at around AUD $500,000 (approximately $350,000 USD), the piece stands as a bold fusion of speed, design, and luxury artistry.
Blurring the lines between engineering inspiration and fine jewellery, “La Velocità” captured attention across the paddock, proving that Formula 1’s influence extends far beyond the track.
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