Schreiner (USA) in style, and a high quality brooch. It is three dimensional with a layer of rhinestones on top of the base layer centred with the top layer of a large square faceted rhinestone. Schreiner were in business during the 1950's and many costume jewellery companies attempted to emulate them.  There are many unsigned Schreiner pieces but this is more likely not to be. Dimension is 4cms x 4cms. It is in excellent condition with a bronzed metal back and roll over safety clasp.  Gift boxed by Vintageonline.