Our Argentium Silver Crystal Earrings are made with Argentium Silver bezels that hold Swarovski crystals and rest on the front of your ear lobe. They have a Niobium post that goes through your ear lobe piercing. Both Argentium Silver and Niobium are nickel free and very comfortable. Argentium Silver (or Argentium Sterling Silver) is 92.5% silver, 6.3% copper, and 1.2% germanium. It tarnishes much less frequently than Sterling Silver. These earrings feature a variety of Swarovski crystals different colors and sizes. They come with Commercially Pure Grade 1 Titanium ear nut earring backs.