Black Onyx is for protection, physical strength, and stress relief. 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. Bar measures 2" across. Bracelet extends out to 9". Genuine gemstone. Natural color variance may occur. Available in 18k gold. Avoid contact with anything containing derivatives of alcohol.