Blue Ethiopian Opal Plain Coins measure approximately 4.5mm to 7mm in diameter, these fiery Opal gemstones have a waxy luster with excellent polish, these beads show slight internal characteristics within semi-translucent bodies, these Ethiopian Opal beads have strong play of color in green-red-golden-blue hues, their body is a deeply saturated treated greyish blue hue, and these Opal are mined from the Wollo Region, Ethiopia in Africa. AA Grade