yes those ones are not particularly rare, i call the type "rosary beads" as often found in that context- the material may be Buri nut as its not as pale as Tagua or Kukui nut. i believe Buri nut is or was a bead material in Indonesia and Phillippines, and sometimes stained on the surface prior to decorative carving in other colours too... would welcome more specific knowledge or examples in context.
Ooh i have beads like these too. I found them strung with beautiful Venetian beads. Will make a pic when home to show you guys :)
I always wanted to post these beads and ask you what they are..such a coincidence they are subject of a post already, very nice to see :)
( I strung them on a tiny wire btw, they were strung on a breaking cord, don't remember exact details, have had them for a few years now I guess)