John Medeiros jewelry all comes with a lifetime guarantee. Each piece is made from a lead-free premium alloy, and are strong and lightweight. They have a permanent non-tarnish, easy to care for finish. Their stones are man-made Cubic Zirconium which will not chip, crack, cloud or fade. Their earring posts are surgical steel, which are ideal for sensitive ears prone to infection or allergies. You'll find intricate hand carved detailing on the front, sides, and back of their pieces.