Tiger eye stone has a rich yellow and golden brown stripes, with a fine golden lustre when polished. It is basically a variety of crystalline quartz formed by alteration of an asbestos mineral (it being replaced by silica) known as crocidolite.An elegant necklace is made of 12mm tiger eye beads,17inch in length.held by a yellow gilded clasp.Each bead is double knotted with durable silk thread for beauty and security.