I have already posted some images on BCN of a 1930's necklace I got fairly recently, the feature beads of which are made of a plastic material which I am still not too sure about. I'm including some again here.

Seeing your imitation turquoise Rousselet beads reminded me that it is just possible that this is a Rousselet piece. The glass beads certainly look similar to his, and the handmade wound nature of them has always steered me away from thinking they are like the Czech versions (many of which were moulded). Also the inset round 'turquoise' glass pieces (probably set hot into the material which has caused melting around the edges) also occur on what I have always thought was a handmade matching clasp.

So, I'm again wondering......

Carole