This gorgeous piece is a gold toned metal crystal and opal necklace. This piece is very well crafted and has beauty from top to bottom. The chain is made up of thin gold toned metal links that are fastened together by a very sturdy pull button clasp in which the button is pulled and then releases the lever. The inside of this clasp has the inscription "U.S. pat. p." that may indicate a patent number or a maker but nothing has turned up yet. The chain on the necklace connects to a gold toned metal loop holding in place a very unique green crystal glass stone. This piece is gorgeous and really grabs your attention. The front of the metal also has an opal colored piece of glass set in gold toned metal. The entire necklace is in great shape and measures 22" long with the centerpiece measuring 1 1/2" in length. A very stunning piece of jewelry.