Silver and agate mid century brooch

Silver and agate mid century brooch although not hallmarked ( probably European)it has been tested for silver lovely small brooch with amazing agate stone 3 cm wide 2 1/2 cm width although can be worn either way
 
Agate is classed as a semi-precious stone – discover the difference between precious, semi-precious, soft porous and treated gemstones and is also a part of the quartz family. Made from chalcedony, agate’s striking vibrancy is applauded by gemstone lovers everywhere. Agate is available in a wide selection of colours, including the green agate variety used in this brooch