These are phenolic plastic beads, post-dating 1926, made to imitate amber, and often used (when of this and similar shapes) in prayer strands.

These phenolic beads are often tested using heat (fire) that makes spots or areas turn reddish or even black (or black outlined in red). Occassionally, imitation amber beads have additional decorations carved into their surfaces—particularly when they come from prayer strands.

Jamey