Sterling silver blue john marcasite four stone house style butterfly brooch m326 complementing our sterling silver and enamel designs the introduction of sparkling and natural marcasite stones provides a classic and elegant way to accessorise any outfit with a certain art deco feel accompanied by derbyshire blue john and garnets the collection features wonderful insect earrings brooches rings and pendants this eye catching butterfly brooch is handmade in sterling silver andfeatures fou