Magic Metal Heartbeat Cardiogram Necklace Gold Tone Heart Wave Charm Pendant NQ68 Fashion Jewelry Ships from the USA Heartbeat Cardiogram Necklace. Wave pendant and heart charm. Pendant Length: 1 inch. Heart Charm Size: 1/4 inch. Length of Chain, Open from Clasp to End: 22.5 inches. Makes a perfect gift. Search Magic Metal Jewelry for more jewelry styles.