This Sterling Silver JH Keyring Necklace consists of a Rolo Chain from John Hardy’s Classic Chain Collection in the 2.4mm width with a functional hinge/connector in the shape of a ring that is centrally positioned. The hinge-enabled open ring/circle can be easily opened to attach and remove charms, medallions, or amulets. It looks great worn with or without charms as pictured (the charms in the listing’s pictures are shown as an example and are not included). The look of this necklace is very versatile and can be both casual or dressy. The seamless built-in hinge on the ring opens and closes perfectly as shown in the video. The chain is 18” in length and has a lobster clasp. The center ring measures approximately 0.5” in diameter (please see pic w/ ruler). The chain and necklace are stamped JH and 92.5 as pictured. I am the original owner, and it has had only limited use. I am continuing to downsize my jewelry collection. This is in Excellent Condition!! The necklace comes with the JH pouch, box, and unused polishing cloth as shown.