Size: Inner diameter 17cm Bead size: Approximately 8.8mm This is a Devil Aquamarine characterized by its deep blue color. It is a high-quality piece. ✨Thinking and Expression✨ This is a natural stone Devil Aquamarine power stone bracelet. March birthstone Devil Aquamarine is a combination of Aquamarine and Black Tourmaline. It can simultaneously balance the energy of the throat chakra and the root chakra. Aquamarine enhances thinking and expression. You will be able to look at your own existence, listen to your own voice, and express your thoughts. It also helps maintain the respiratory system and thyroid gland.