Measure your wrist with a string, ribbon or tape measure SNUG WITHOUT SLACK - directly above your wrist bone (on the wrist you are going to wear it on) - to determine your size wrist.
(We need you to measure your wrist, not another bracelet.) This measurement allows us to create a bracelet with slack in it, so that it comfortably fits your wrist loosely and dangles.
Also, several sizes may fit one person, depending on how you like to wear it. Some women like it tighter (like a cuff), but most prefer it looser (like a bangle).