The rare and intriguing metal Niobium has very special properties. When it is placed in an anodizing bath of mostly water, it changes colors as you run electricity through the bath, producing vivid rainbow colors that are permanent! Our collection of Niobium hot air balloon earrings is hand crafted in New Mexico with wonderful style and attention to detail. Niobium is even used for the ear wires, which makes them totally hypo-allergenic – people who can’t even wear gold can wear Niobium with ease. Light, delicate designs reflect the charm and color of ballooning, making these earrings guaranteed to draw compliments when you wear them! 3/8″ high balloons.