pendant shape: key ;gemstone shape: heart the key necklace is made of alloy , no nickel, no lead, no discoloration and no rust. suitable for sensitive skin, comfortable, safe and healthy. it can be worn for a long time, and your skin will not turn red or green you can gift it to your mother, lover, friend, classmate, sister, yoga lovers on important days: mother's day, christmas, valentine's day, thanksgiving. send them blessings. we are committed to providing each customer with jewelry and a satisfying shopping experience..syi