I agree with Floor they are probably Czech glass.

Typically they would make a white bead, then roll the molten bead in powdered frit (colored glass). These beads used a very fine powder to create the color.

The only example I was able to find has a French clasp, so sorry for the confusion.

When I see the Japanese faux coral they are usually round beads and have on pink spot. Graduated strands are not typical with Japanese beads.