Repair with Adhesive

• 1). Choose a new bar pin in an appropriate size to fit on the back of your brooch without being visible. Bar pins come in a variety of sizes and alloys, including sterling silver, which is ideal if your brooch is made of other fine materials such as precious gemstones.
  
  
• 2). Rub coarse sandpaper over the smooth front surface of the new bar pin. Rough up the surface to help the heavy-duty jewelry adhesive adhere to it with greater ease.
  
  
• 3). Apply a thin layer of heavy-duty jewelry adhesive to the back of the brooch where you wish to reattach the bar pin.
  
  
• 4). Apply a thin layer of the jewelry adhesive to the front portion of the new bar pin that you have sanded.
  
  
• 5). Press the new bar pin onto the back of the brooch. Clamp the bar pin and the brooch tightly together using a clothespin or other clamping device. Place the brooch in a dry, cool place where it can remain undisturbed while the adhesive dries for at least 24 hours.
  
  

Repair with Solder

• 1). Obtain a new bar pin and solder in the same type of fine alloy as the brooch.
  
  
• 2). Apply flux---a substance that helps solder to flow and adhere---to the back of the brooch and the front of the new bar pin using a paintbrush.
  
  
• 3). Position solder where the bar pin and the brooch meet.
  
  
• 4). Heat the solder with a butane torch until it melts.
  
  
• 5). Allow the solder to cool and solidify.