Two Vintage ( I Think) Necklaces, Flea Market Find

The green one is ALL glass and weighs 1/2 a ton. The other one is all plastic, aside from the glass Aventurine beads, and weighs a 1/4 ton. The woman I bought the second necklace from told me it was very expensive when it was new, so she wanted $2.00 for it....the green one cost me $3.00, bought at another stall.

I'm thinking about taking them apart and making a new necklace from the glass bits and giving the plastic bits away to a second hand shop ( I hate plastic necklaces). I also have quite a bit of spare slag glass from another necklace I dismantled due to some broken glass beads. Not sure now, as I rather like the green one!