Possibly Murano Glass (end of the day)

Hello this necklace belonged to the grandmother of my good friend she wasn't keen on it and gave it to me I'm guessing it could have been made anytime from 1920s - 1950s?. A jeweller friend says it's glass she thinks its murano glass the beads look like they're made in 2 halves and put together. The colours are unusual. I have often wondered about these beads and their slightly odd patterns are they random or meant to be like that?