Brooches by John & Dawn Field This brooch is made from sterling silver with and 24 carat gold plate. In the centre it features embossed binary numbers, some of which are highlighted with gold plate. It is domed in shape and measures 45mm in diameter and it has a unique wrap around sterling silver pin. The surface of the brooch has been textured to give it a worn, aged look and a '925' sterling silver mark and our makers mark 'J D F' has been stamped on the back. Features Primary Material : Sterling silver Other Materials : 24 carat gold Pin Type : pin Dimensions (mm) : 45 One of a Kind : No Metal : 24 carat gold and Sterling silver Hallmarked : No Cleaning InstructionsThis brooch has been finished with a clear, protective, anti-tarnish coating.