Silver Lab Grown CZ Stud Earrings 8mmLab grown alternatives to mined diamonds are the most ethical way to sparkle and they are increasing in popularity with younger shoppers who are more concerned by the environment than they are about owning natural diamonds. These beautiful cubic zirconias are set in sterling silver. The rubbed over setting is a classic style, enhancing the round shaped of the stone and holding it securely. They are a beautiful stud earring that can be worn everyday.