This gleaming gem radiates magic and appears to be a valuable item. 

It is cursed, however, and it brings both 100% more likelihood of encountering wandering monsters and 100% greater likelihood of pursuit when monsters are encountered and the party seeks to evade them by flight. 

Once picked up, the jewel of attacks will always magically return to its finder (secreting itself in pouch, bag, pack, pocket, etc.) until a remove curse spell or an atonement is cast upon him or her.