Eyeglass chain made with natural apatite and 14KGF. 14KGF is covered with a thicker layer of gold than gold plating, making it more durable and less likely to cause metal allergies, which is recommended! Note: This does not guarantee that everyone will be allergy-free, so please wear it while monitoring how you feel. The design is very delicate, so please be careful as it may break if pulled strongly. Thank you for viewing.