Grade AAA genuine natural black onyx beaded bracelet. Black Onyx crystals can be used for grounding, protection, & self-control. TO MEASURE YOUR WRIST: You will need a flexible measuring tape OR something flexible to wrap around your wrist & a ruler (See example in pictures). Wrap the measuring tape around your wrist, making sure to wrap it all the way around your wrist. We suggest measuring your wrist in the area you ultimately wish for your bracelet to sit. Black Onyx Beaded Bracelet