The Power Gemstone Brooks Bracelet features genuine gemstones on an adjustable beaded chain. The vibrant, black onyx gemstones bring protection to the wearer. Whether you wear solo or stack multiple for extra good energy, the meaningful gemstones bring the perfect pop of color to your everyday stack. Black Onyx is considered a stone of self-mastery. It has a powerful energy that stimulates all of the senses so that you are alert, grounded and focused, thus enabling a strong field of protection.