Brooches by John Field This brooch is slightly domed and it is made from sterling silver and 24ct gold and it measures 30mm in diameter. The technique used is an ancient Korean one called Keum boo, where the gold is fused to the silver. Letters and symbols have been punched into the surface by hand and the surface of the brooch is given a worn effect to simulate the look of an antique found object. The inspiration for the marks on this piece came from looking at old nautical instruments. Features Primary Material : sterling silver Other Materials : 24ct gold Pin Type : pin Dimensions (mm) : 30 x 30 x 1 One of a Kind : No Metal : 24ct gold and sterling silver Hallmarked : No Cleaning InstructionsThis keum boo brooch has been finished with a clear, protective, anti-tarnish coating.