Compression many years ago caused this swirling lines mimicking the deep canyons of the desert. The stone is attached to a copper plate; and includes both a 16" 1 mm sterling snake chain and an 18" 2 mm black silicone cord. Like more than one stone but don't need two sets of cords? Purchase them both and $16 will be refunded to you. (Second stone only is $10.00).