An item that puts a horible curse on the victims of its spell.
A dark emperors gloves that make an excelent weapon and torture tool.
Elementalist have commonly used jems to further their powers over nature.
What about a 'criminal' society with distinct laws - for stealing, the larger the value of something stolen, the less punishment the courageous thief recieves (but must return it of course). For this pirates(?) caught petty thieves deserve to be punished harshly. If you take, you better take a lot.