Ring Surface: 11mm Metal Material: Solid 925 Sterling Silver Metal Electroplating: Rhodium Ring Size: Open Size/Adjustable Inner Diameter: 15.1mm ~ 16.9mm Total Weight: 1.79g A creative and thoughtful design. Luck, happiness, and health, these 3 sterling silver rings are from our designer Amber Zeng. 3 rings represent luck, happiness, and a healthy life respectively, then 3 rings join together, which means luck, happiness, and health can transform for each other. Metal use 925 sterling silver, with three layers of white gold plating. Allergy free.