This is a small, Art Deco brooch consisting of a green, swirley Bakelite rectangle set into a silver metal setting with cabochon black stones and marcasite. It is in 3 parts. The top is a bar with a black cabochon stone. It has a drop which holds the bottom part. This has the rectangular Bakelite piece (tests weakly with Simichrome cream). This piece has 2 black cabochon stones (do not know if these are glass or onxy). On the back - difficult to see - is the work 'sterling' and 'pat'd'. The whole brooch is set with very small marcasite stones. It measures approx. 2 1/4 x 1 inch. Although quite small, it is a lovely example of an Art Deco brooch. Reference 2627 B112/27