Natalie of NYC handcrafts this otherworldly brass cuff using genuine aura quartz - a stone believed to calm the mind and bring peace and joy to its wearer. Each aura quartz flashes a rainbow of color when placed in the light. Each natural stone may vary in color, size, and shape. Handcrafted for Uno Alla Volta, from the heart and hands of the artisan. Dimensions - 0.5'' wide, adjustable.