I have a similar necklace. Mine is pink glass teardrops, like clusters of grapes, joined by lucite circles. It was given to me by my aunt who, as a teenager in the 30s, stayed in Paris. The necklace was in an old French jewellery box together with another, galalith and glass, which Jean Rousselet kindly confirmed is indeed 1920s Rousselet, adding 'we still have some of the beads'.