This tie pin of real silver can be fired directly in the clay.
Make the end of the pin rough with a file or pliers and use paste to fix the pin in your clay.
Attention: Do not fire higher than 750 ° C because of brittle becoming silver.
Black silver can be made beautiful again by means of a safe acid bath.
You can also solder the pin on your fired workpiece.
Note: without a tie pin protector!