Massive brutalist vintage blue stone necklace that I bought from NYLuluVintage here in Chelsea, NY. The light colored goldtone chain itself is not that heavy but the stone has some weight so it’s quality. Please see all pics for condition. Lulu said it’s from the 1960s and it’s agate but I’m not sure because I don’t know anything about stones. A quick Google search shows that some say it’s lucite. I also don’t know if the chain is original but in otherwise very good vintage condition.