This Black Obsidian Adjustable Bead Bracelet is a beaded bracelet made of natural Obsidian beads. 
Black Obsidian Stone is a powerful cleanser of psychic smog created within your aura and is a strong psychic protection stone. This stone has powerful metaphysical properties that will help to shield you against negativity. The energy of these stones may stimulate the gift of prophecy and may boost precognition.
Wearing a black obsidian bracelet is said to be one way to attract wealth and good fortune
How to Measure Wrist
 
With a measuring tape measure just above the wrist bone, then make sure to add approximately ¼ inch to 1 inch (a ½ inch is average) depending how fitted you want your bracelet to be.
Bracelet fits wrists sizes: 6.5-10in