SAFE FOR SENSITIVE SKIN Our heavy-duty plating is free of nickel, lead, & metals that irritate the skin. In 5 years, we have yet to receive a complaint about an allergic reaction. Will not turn skin green. ANTI-TARNISH 18k GOLD-COATED Post: 925 sterling silver - plated with thick layer of 18k gold. Cross: thick layer of 18k gold over brass. Very tarnish-resistant. Durable for long term wear.