Indeed, I already said in a conversation on the forum that the black chevron beads were not common. But I was told it was wrong and they were frequent. I think they have never been very prevalent on the African market. In 40 years of Africa I did not find many. Here is a photo with black chevron beads of different sizes from my collection. On the one hand, I found larger black chevron beads as the largest bead in the picture. Besides there is one on my site KIKASBEAD. It was a little easier to find small black chevron beads like other beads but never very very frequent.