Possible dupe method,still testing, these may give u ideas : KO Submissions

Ok, first method is fairly simple and dose not yet perfectly work, but here goes anyway. you trade an item ud like duped to a friend. while the trade screen is still open and your freind has already pushed the trade button this is what u do. press the x in the top right corner of the trade screen and press enter at the same time. this may take a few attempts but u should have one of the item and so should ur friend. this isnt a real dupe becuase u wont be able to move the item or sell or equip it. it'll also be gone when u relog. this is only a client hack but that dosent mean the item will be totally useless. maybey if u duped abyss gems then ud be able to fool the npc into really thinking u have multiple gems. i havent had much chance to test this but maybey someone will get an idea on how to use this bug.

This dupe is only client side.