This unique Ethiopian opal gemstone is 17.75 X 13.7 X 6.36mm it is a natural solid opal gemstone. It was ground & polished into this oval shaped cabochon gem from natural crystal opal rough that was mined in Ethiopia. This genuine opal gemstone has fine quality color play. It is completely natural with no dyes, no glues, no laminations, and no treatments of any kind. This superior quality opal gem is flawless with no imperfections. It is transparent with natural color play inside. Transparent opals with color play are also known as crystal opal gems. This unique Welo opal gemstone has fine quality color play with flashes of green, blue and red color play.