I have a vintage Monet gold tone double link chunky necklace. It is 19 inches long and has a simple hook clasp. I don’t see any metal content markings and is very slightly magnetic so I don’t know what the metal actually is. There is one link towards the clasp that has a single circle instead of two (see the last picture). It is marked Monet. See my other ads for jewelry, artwork, home decor and more.