This is a client-side bug, what happens is this: You mine the gem, and put it in your 'hand' when you mine anouther ore, the server sends you info telling you the new contents of your invintory, basically refreshing the invintory, so you see a gem in the invintroy, but you still have a gem in your hand, both gems are the same gem, the client just sees it as 'in your hand' and 'in the invintory' at the same time becuase of this slight oversight, its nothing big, and cannot be used to clone items, i hope this helps.
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