This is a vintage Czech brooch from around the 1930s. It has a central mottled green glass stone. It is mounted in a white metal. Unusually for this sort of brooch, it has marcasite stones set into a leave pattern round the edge - and a central cluster of marcasite. I love vintage Czech jewellery and always have some pieces in my shop at Grays Antiques - near Bond Street tube station in central London. www.gillianhorsup.com - reference 2737 C5/2 price £68.