Black Ethiopian Opal Plain Rondelles measure approximately 3mm graduating up to 6.5mm in diameter size, these Opal gemstones have a waxy luster with excellent polish, these beads show no matrix on their semi-translucent bodies, these Ethiopian Opal beads have scattered play of color in green-red-golden-blue hues, their body is a deeply saturated treated black hue with a strong blue tone, and these Opal are mined from the Wollo Region, Ethiopia in Africa. AAA Grade