Delivering accurate, consistent & transparent diamond certification powered by innovation & integrity.
Established in 2007, SGL is a UK-based diamond certification lab headquartered in London. With a presence in 5 countries and 25 global locations, we deliver trusted certification for both Natural and Lab-Grown Diamonds — setting industry benchmarks in accuracy and reliability.
At SGL, every diamond is thoroughly tested using advanced technology to ensure authenticity and superior quality. Our skilled gemologists apply deep scientific expertise to deliver accurate, trustworthy certifications that uphold our commitment to transparency and excellence.
Beyond certification, SGL is committed to fostering global awareness through research, workshops, and strategic collaborations. We deliver trusted knowledge on diamond classification, identification and treatments — empowering jewellers, retailers and consumers alike.
At SGL, perfection drives excellence in gemmology, technology and education, ensuring industry-leading standards.
Precision is key. We implement rigorous measures to maintain trust and reliability in every cerfitication
Quality defines us. Our commitment to excellence and customer trust sets new benchmarks in cerfitication.