Onyx: Black Onyx Crystals can be used for grounding, protection, and self-control, and as a shield against negative energy. It also enhances the discipline, allowing more ease in following through on goals and completing the tasks.
Strongness: Agate and Onyx, both are varieties of layered chalcedony that differ only in the form of bands. Onyx has parallel bands, whereas Agate has curved bands. The colors of its bands range from black to almost every color.
Scratch-resistant: While the Onyx is a gorgeous and mysterious gemstone, it is not very resistant to scratches and chemicals. If you clean your Onyx jewelry the wrong way, you could damage the stone. Also, if you don’t store it properly it can get scratched or lose its lustrous look.