A CZ-encrusted moon stud has a petite gemstone hanging from the center. Opal is known as the joy stone, intensifying happiness and encouraging freedom of emotions. Tarnish Free - Long lasting protective coating safeguarding your jewelry from sweat, water, and more. Sterling Silver Posts – 18K gold plating over brass Hypoallergenic – Lead Free Lab Grown Fire Opal White CZ stones Approx. 10mm across