Pretty round Art Deco style symmetry with an emerald cut light blue glass center stone marks this lovely pin in the style of the 1920's.  Although unmarked, the swirls on the back of the silver tone setting suggest that this pin was part of the "1928" Company's collection of Deco revival that was popular in the 1980's.  The pavé set rows of marcasites are a combination of a faux marcasite looking setting that has real marcasites on all the edges of the circles.  Although not truly vintage, it is still an attractive piece.  Measures 1 3/8" in diameter