They use .935 Argentium Silver, which is made from recycled silver and does not contribute to unnecessary pollution caused from mining. Argentium Silver is 1% purer silver than Sterling Silver (.925) and has many positive attributes that Sterling Silver does not possess.
Argentium Silver is hypoallergenic, tarnish resistant and shines a brighter white than Platinum. Jewelry made of Argentium Silver is embossed with a unicorn symbol; all silver Pontus & Hawke jewelry bares the unicorn emblem.