I think this is curious gem dupe maybe : Diablo 3 General Discussions

so i always mess around maybe once a week looking for dupes exploits so on and so forth

Try this, have a stack of gems, and right click and split one off then take that split one and place it inside a pieace of armor when you place it in watch the Stack of gems

if you have 25gems
you put it in while your holding the gem it says 24

when you place it it will put the gem inside the armor and also say
that it has 25 gems back in the stack for a few seconds !

play around with this i havent had to much time but i was gonna try dropping the gem stack really fast to see if i can get it to place the gem into the armor and drop the full stack amount !