Vintage Very Long Beaded Necklace

This is a lovely and very long vintage necklace from my grandmother’s collection. It’s very long and can be worn like that or can be double looped for a tiered look. It has dark silver beads (almost hematite in color but not quite) in varying sizes. Please note that I’m not a jewelry expert and I do not know what may be real or not. Everything posted is just my estimate/guess. I will do my best to gain accurate descriptions and measurements (I do have a ring measurement tool).