Mystery Beads...

I dug out these old hand-carved matte mystery beads that I would like to mix with either large chunks of turquoise, chrysocolla or even some rough chunks of black tourmaline. I think they might be carnelian, certainly agate -- but the buttery yellow beads are throwing me, if they have a different name possibly. Looking at them under bright light, you can clearly see banding inside.

Anyone have any suggestions?

Thanks for looking!