The World's Largest Retailer of Diamond Jewelry As the world’s largest retailer of diamond jewelry, it’s our duty to hold not only ourselves but every member of our complex global network of partners to the highest standards for the sustainability of our planet and protection of human rights for those who work within our supply chain. Signet is a co-founding and 3-time certified member of the Responsible Jewellery Council (RJC) since 2005, and we require 100% of our key suppliers become certified RJC members by 2025. This ensures that we’re able to fulfill our mission to help customers Celebrate Life and Express Love by providing them quality jewelry that has been sourced and produced with integrity.