It is a silver ring that has a green olive peridot gem (with 4 cuts) embedded on it. The ring shines with a bright yellow glow whenever he channeled his sorcery through it.
HistoryThe ring was presumably given by Merlin to Balthazar after he fully mastered his sorcery, and became the conduit for his magic since then.
Powers and Abilities
It has all the powers as other standard magic rings.