In 2017, we obtained the Chain of Custody certification from the Responsible Jewellery Council. This recognition reflects our commitment to responsible extraction and processing, based on sustainable practices and rigorous gold traceability. It is a journey rooted in ethics, respect, and a long-term vision. From 2026 onwards, Mattioli also files its Sustainability Report, further reinforcing transparency and accountability across all operations.

Mattioli selects its suppliers with the utmost care, strictly adhering to the Kimberley Process. In this way, the diamonds that illuminate our creations carry no trace of conflict, but reflect only a light of peace, responsibility, and respect. On every invoice, we require a declaration of guarantee, a tangible commitment to purity and transparency throughout the entire sourcing journey. An enduring promise that accompanies each jewel, from its origin to the moment it is worn.