Argentium Silver Leverback Hoop Earrings. These earrings are handmade of Argentium Sterling Silver for a shine that will last longer than traditional sterling silver. Argentium Silver is 93.5% pure silver as opposed to 92.5% of standard Sterling Silver. A touch of Germanium keeps them shinny longer. Shaped, hammered, and polished. The hoops are 18 gauge, thin enough to be very light, but tumble hardened to remain durable. Hypoallergenic 316L Surgical Steel Leverbacks. The largest hoop is approximately 1" in diameter. Includes polishing cloth for all jewelry. Shipped in gift box.