Japanese Three Strand Necklace

Any idea what are the big beads, glass? They also seem to be covered with some kind of thin foil like.
Most of the rest is glass, pearls ( faux I guess) and plastic like.

 

They look like they're probably all glass. The large funky looking ones are called "lava glass beads." The ones that look like pearls might be coated glass or plastic.

The amber ones are lampwound beads and the small black ones look like pony beads.

 

The little ones are just spacers. The funky ones are some kind of foiled lampwork. They're rather fragile. This is a classic 60s multi-strand Japanese necklace. A few years ago they were really popular; now I have a hard time giving them away. If you're planning on keeping it, I'd restring it just in case. These were on cotton, and eventually it always falls apart.

 

Thanks for the replies.
I figured the foil beads are fragile. My daughter just broke one.