Fabulous 1920s-1930s Art Deco Point Up Square Stone Black Necklace with Rhinestone Clasp can be worn with the clasp in the front or the back. It measures 16 inches closed. In excellent condition for a piece of it's age. The stones are square, not sure if they are jet or glass, but they are so interesting in shape and design, it doesn't really matter when worn. It is 5/8 inch wide.