Gemological Science International (GSI) is a global gemological organisation providing grading, testing, and certification services for diamonds and gemstones. This coverage explores GSI’s work within the UK and international jewellery sectors, highlighting its innovations in gem identification, technology adoption, and laboratory standards. Jewellery Focus reports on GSI’s partnerships with retailers and manufacturers, its contributions to transparency and consumer confidence, and the broader role of certification in supporting ethical sourcing and trade integrity across the jewellery supply chain.