This essential piece features a secure clasp, non-tarnish and waterproof design, making it perfect for everyday wear, travel, or beach outings. Stack it with other favorites or wear it solo as a sleek statement piece that complements any look with understated elegance. 18k gold plated stainless steel or stainless steel Hinge Closure Waterproof and hypoallergenic Approx. Inner diameter: 2.4" Approx. Thickness: 8 mm Wipe with a gentle cloth after each wear