Unsigned Schreiner New York.  Contains the following design choices that Henry Schreiner often chose:  Layered construction, eye & hook connectors, inverted stones, Maltese Cross design was often used & when you look at the open work on the back you will see there is no area to hide the Schreiner Cartouche.  Large Maltese cross that is set w/ champagne/yellow open back unfoiled pear, tapered baguettes & baguettes.  The contrasting color is olive green navettes & a square faceted olive green center stone.  All of the stones are prong set.  The baguettes are inverted.  The brooch also has the hook so it can be worn as a pendant.  Wonderful vintage condition.