A beautiful untreated Boulder Opal from Australia with all the colors of the rainbow flashing and dancing inside. A stunning pendant piece ready to be set. Like most to all Koroite Boulder Opal the opal is resting on a matrix of Ironstone. Very colorful with a good flash and a complex play of color. The pictures don''t do this piece justice. Looks much better in person. The back is polished. 13.30 cts Approximately 2.2 cm x 1 cm x0.40 cm