Brooches by Yvonne Gilhooly Unique Brooch. Beautiful autumnal landscape in this large dendritic agate, set in sterling silver with a steel double pin for security. Features Primary Material : sterling silver Other Materials : dendritic agate Pin Type : double pin Dimensions (mm) : 60 x 60 One of a Kind : Yes Metal : sterling silver Gems : dendritic agate Hallmarked : Yes Cleaning InstructionsClean with a silver cloth