This precious stone is known for the energy of strong support, stamina, and determination to help one's persevere. It is said to teach the wearer to rely on own powers; which is then often crafted as traditional wealth bracelets and amulets. This Piece of Black Onyx has been wire wrapped with a Tree Of Life Design and measures 4cm x 2cm x 1cm approx and is suspended from 20 Inch Silver Plated Chain. Black onyx crystals can be used for grounding, protection, and self-control, and as a shield against negative energy. It also enhances discipline, allowing more ease in following through on goals and completing tasks. Onyx is the birthstone for Leos and the anniversary gemstone for the 7th year of marriage. Black Onyx is the anniversary gemstone for the 10th year of marriage. Onyx is a variety of the microcrystalline quartz, called chalcedony.