Madagascar Hawk's Eye Eyeglass / Sunglass Necklace. Made with matte Madagascar Hawk's Eye beads which are cousin to "Tiger's Eye", Hawk's Eye is a Chatoyant Gemstone; it is a phenomenon which is caused by tiny inline fibrous needles within the crystal structure causing light to reflect in a linear pattern. These beautiful Hawk's Eye beads used on this eyeglass necklace have a gray-brown to golden color and are sumptuous looking with antiqued gold spacers, faceted golden crystals, and crusted gold tone beads. Measures 28 inches long with adjustable stretch ends to fit most frames.