Size: One size Available in a single size; depending on the shape, the pendant weighs between 6.10g and 7.23g. Mao the Cat with black onyx stone Available in three animal shapes: Bao – Bear Mao – Cat Vao – Dog Onyx This mineral has been known since the Middle Ages and is actually a form of black chalcedony (agate). It’s often confused with obsidian or black tourmaline, so it's important to buy carefully, as all three stones have very different healing properties. Onyx is most known for enhancing self-awareness, clear thinking, and logic. It can be especially helpful for emotionally unstable individuals, as it balances the flow of energy within the body. It is a powerful protective stone that repels negative entities. Onyx boosts vitality, strengthens perseverance, and provides support during stressful situations.