Antique Victorian 49" guard chain in gold fill with a 12K gold slide. The pretty slide has two seed pearls and a green stone; it tests as 12K gold. It measures 3/8" by 5/16". My jeweler inserted a filler to make the slide more stationary. The chain itself has a tiny ring at one end for adding a pendant or a clasp. At present there is no clasp and the chain slips over the head.