This 3D anatomical heart necklace features lifelike details on all sides - from the four chambers to the arteries and veins. The size of your fist & one of your most vital organs, your heart beats 72 times a minute; 100,000 times a day; 3,600,000 times a year; and 2.5 billion times during your lifetime. Treat it well and your heart will create enough energy to take you to the moon and back. Silver version comes on a simple sterling silver 18" cable chain with a spring ring clasp, adjustable to 16". The charm measures 13x8mm, excluding jumprings. Gold tone version features a bronze charm on an 18" gold-filled chain does not adjust. • Made from Recycled Sterling Silver. · Available in Sterling Silver & Bronze •Lipped necklace cards will come free with every order. Please note that necklaces will not be pre-carded. · Bronze oxidizes naturally over time.  Moisture under rings can accelerate the process and cause skin discoloration. We recommend removing bronze rings when washing hands.