• Nickel Free • Hypoallergenic • Sterling Silver• Diamond cut • Diameter: approx. 30 mm • Lock mechanism: clip lock (easy to use) Certified Nickel-Free by Athena Allergy Inc. using Nickel Alert™. These earrings are guaranteed safe for those allergic to nickel. Our promise to you: You will never have a problem with a Certified Nickel Free product!