Reveal what's in your heart with the Colour-Changing Hidden Message Heart Charm. At room temperature, these Pandora colour-changing charms look like a rounded heart with bright red enamel... but when you hold the charm, it heats up and the enamel turns pink. This reveals a secret message: "I (heart) U” on one side of the heart and “ALWAYS” on the other. A playful Pandora heart charm for the one you love with an extra surprise.