Heavy with the weight of real stones - it's hard to tell exactly which type but it's possible that there is onyx, black jade, abalone, carnelian, glass or quartz, tiger's eye. I bought this at a reputable vintage store in NJ but haven't worn it. The logo plate says AS and there is a tiny inscription on the toggle that looks to say 1/20 14k. 18" long on the strand with the clasps, with a few strands hanging below that Tags: Trifari, Miriam Haskell, Catbird, Pamela Love, Tiffany, Taxco, Betsey Johnson, Avon, Joan Rivers, Wild Bryde, Missoma Cornelia Webb Gas Bijoux Rosantica Isabel Marant Kenneth Jay Lane Sydney Evan Foundrae Lauren Rubinski Jennifer Meyer Mason Books Monica Vinader, Monet Lizzie Fortunato David Yurman Dina Mackney Sydney Evan Barrera Ben-Amun