Responsible Jewellery Council (RJC) Code of Practices Certification. RJC is the global membership and standards body for responsible jewellery throughout the entire supply chain – from mine to retail. The RJC Code of Practices 2019 is the only industry standard covering the entire jewellery and watch supply chain. RJC is the leading standards authority in the global watch and jewellery industry and works. RJC also works with multi-stakeholder initiatives on responsible sourcing and supply chain due diligence. RJC Certification requires independent third-party auditing by RJC accredited auditors to verify that a Member's management systems and performance conform to.