Each piece will vary in size, color, shape and texture. Material: .925 Sterling Silver Stone: Faceted Sea Foam Chalcedony Size: Approx 9mm Care instructions: Silver jewelry should not be worn in the shower, pool, or the ocean. It can damage the finish more quickly. Pearls, gemstones, and stalacities should be handled with care. Oils and other liquids can permanently damage or change the color of the stone.