Ethiopian Wollo Black OpalPlain Round beads measure approximately 3mm graduating up to 6mm in size,have a way luster on an opaque body and a smooth polish on a symmetrical roundshaped body. These Opal beads originate from the Wollo Region in Ethiopia which is the only African source for Black Opal, the beads show a strong Red, Blue, and Green play of color on the dark black bodies for exceptional fire, and these beads are well matched for quality on the strand. Beautiful Red, Blue, and Green Fire!