Niobium, Sterling Silver and 14K Gold RingNot merely created; engineered. A solid Niobium band is wrapped in sterling silver, then riveted together using 14K gold rivets, carefully hand hammered into place. The contrasting colors of dark niobium with the white sterling and warm yellow gold make this ring both eye catching and different. Niobium is a perfect metal for those who have metals allergies it is not an alloy mixed with other metals (niobium is an element on the periodic table) and is