Medallion - a piece of jewelry, usually having a circular or oval shape. It is worn around the neck, wearing a chain or a suitable string. Medallions may be made from any precious or semi-precious stones and metals, wood, bone, plastic, and other materials. A special kind - opens the locket, which can be put anything, such as a photo.
It is believed that first appeared medallions in ancient Rome. So-called special medals that, unlike conventional, should be worn on a chain. These medals were more like jewelry than signs of military glory. Over time, they began to perform only a decorative role.