Instead of rerolling the whole slots, what about just letting us choose the slot that we want to reroll?
Of course, random reroll it will be.
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Due to a large number of players in the endgame, I would like to revisit this topic 
If it is not technically possible to reroll individual slots, it may be feasible to keep desired ones.
Since the first attribute per gear part is fixed, you could set checkboxes for the other three slots that block a reroll. And each blocked slot could cost 100 gems, plus 100 gems for each rerolled slot (300 gems / reroll). That would be 100 gems more than now, but the knowledge of being able to keep attributes should be worth it 
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