This is a  vintage tribal art pendant from  Persia / Iran.   I was given it in 1965 by the father of an Iranian scholar. It has never been cleaned and has been stored for decades. Wears beautifully.  I wore it with a ribbon high on the neck.   The mosaic of all colors of  turquoise from the mines in Iran. The inlaid symbol seems to mark the 4 elements and the center, or directions.  The backing looks like brass or bronze and was hand-cut.