Black ebony wood beads from the Philippines. These beads measure 6mm, and there are 72 beads on the 16" strand. Ebony is a dense black/brown hardwood, coming from several species in the genus Diospyros, which also contains the persimmons. Unlike most woods, ebony is dense enough to sink in water. It is finely textured and has a mirror finish when polished, making it valuable as an ornamental wood.