This appears to be a piece of silver or gold jewelry used to fasten a cloak or cape. In addition to this mundane task, it can absorb magic missiles of the sort generated by spell or spell-like ability A brooch can absorb up to 101 points of magic missile damage before it melts and becomes useless.
Caster Level: 1st
Prerequisites: Craft Wondrous Item, shield Market Price: 1,500 gp; Weight:-.