My first bakelite necklace and interesting bangles

I found a good czech website where people sell grandma stuff for cca 1 EUR a piece, the problem is you cannot determine everything just by photo. Postal fees to Slovakia add a few EURs, as well. I bought some stuff I didnt want to, well, my friends were happy to receive a few extra costume jewelry pieces for free :)))
Still, when I checked the packages I received yesterday, I was overjoyed - the necklace tests as bakelite.
The bangles from this package were very interesting as well. Not sure if they are old or new, but the green one looks very deco. Its not bakelite. I hoped the yellow one could be amber, but its not.
What do you think about the green bangle? Could it be deco?