This 18" necklace is an ideal accessory for your wardrobe. Maybe you just like the colors the way they are, or maybe you like them because they are in Jet/Light Colorado Topaz, the official school colors for such teams as the University of Iowa, the University of Pittsburgh, Purdue University, the Pittsburgh Steelers, the New Orleans Saints, the Baltimore Ravens and many more. Each measures 18mm in diameter, not including the loop. Comes with an 18" silver-plated chain. Made with Austrian crystals. Manufacturer direct from a trusted supplier.