this is a stacking bugg with stackable items, every time you unstack a gem from a stack, you double the sell price of the gem, i ended upp with 3.2 billion in gold after the campain since i socketed alot of gems into geare and swaped around settups to test stats when i sold all my low lvl gems after the campain, it's dumb. It will happen every time a gem is unstacked, meaning if you drag over a stack with gems to socket into geare you now gold glitch duped your gems, so by now 90% or all players have abused this bug knowingly or unknowingly by endgame, since most ppl will end upp selling low lvl gems after a while.

i had the same thing when sorting my stash to make space and just by moving them around 2 of my gems cost over $500mill to sell, its such an easy way to make it look like you hacked the game and get banned for it