Another suggestion I'd like you to consider. Could you change it so that you can unequip your amulets without destroying them, so that e.g. I can unequip an amulet with a dura of 4/20 and if I equip it it'll start with 4/20. The reason behind my suggestion is simple. Many players play many different classes. And while a mdps prefers the matack, if this player also plays tank the matack is useless and they might prefer pdef instead. If you just reeuipped an amulet you have to destroy it and loose possibly 19 out of 20 dura points or play without the prefered amulet.
Greetings.