Nessmuck,.... a Cevron bead is a multi-layered glass bead that was used for hundreds of years, all around the world, for trade.
They can vary in size, from small to very large,.... up to 'bout the size of a chicken egg.
If I can't find the size Cevron I need for my shooting bag (I do have one, but it's too big), I can also make a large plain bead out of deer antler.
https://en.wikipedia.org/wiki/Chevron_bead