Wearing pearl jewelry is not easy to cause skin allergies. This has already been introduced. In fact, among the damages to the body caused by jewelry, double necklaces are the most prominent. The level of damage caused by pearl jewelry to the body has been confirmed by scientists’ investigation. It is related to the thickness of the skin on the worn area. The skin on the neck is much thinner than the skin on the hands, so wearing a necklace causes more skin damage than wearing a ring on the hands. If the jewelry worn has strong radioactivity and is worn on thin and sensitive skin areas, it is easy to induce skin cancer. Generally, when wearing a pearl necklace, it is important to avoid wearing it for too long and to keep the neck in a relaxed and resting state. If there is an allergic reaction to the skin on the neck, the necklace should be immediately removed to maintain the beauty of the skin