Agate & Black Onyx weight - 56g Length - 18 cm Elastic / Stretch. Will Fit Any Size Hand. Spiritually, both Agate and Black Onyx offer grounding and protection, but Black Onyx is known for intense strength, focus, and absorbing negativity for willpower, while Black Agate (often solid black, a type of onyx) emphasizes emotional balance, stability, and courage, helping with healing and releasing past trauma. They're both powerful root chakra stones, creating a solid foundation for spiritual growth and self-control. Item will be shipped by registered mail with tracking number.