Do the right (or lower) oval beads have a sort of "pearly" sheen?

They remind me of recent beads I have seen, used as "worry beads" made for the Greek and Middle Eastern market--like a Muslim hand rosary. But those beads are fairly small--and your photo does not present a scale.

I would recommend hot-needling these beads to determine what plastic(s) they are made from.

Be well. Jamey