Although it appears black and white, the darker color in this agate is truly a very deep green. It measures 1.25" x 7/8th", is attached to a silver-plated backing 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/necklaces? Purchase them both and $16 will be refunded to you. (Second stone only is $10.00).