Altering Item Charges with Triggers

I'm want to know how I would alter the number of charges an item has with a trigger, My map involves collecting gems. You start with1 gem you pick up a gem the charge of the initial gem increases to 2 and the picked up gem is removed. Can you tell me how to alter the charges with a trigger. No way in hell am I making 99 separate items with different numbers of charges.

Please?emote_confused

99 items with difrent charges, sorry. only way to do it.

Why dont you make the charges count down? Make it so to pick up a gem, you have to cast the "Pick up gem spell" Which is what the 99 charged gem casts, but make sure that the gems that u pick up r the only things the spell can damage, like make the spell only target wards, and classify the gem as a ward, and thats it, its kinda complicated, but it can be done.

PS: Ull need to know how to edit spells, or get sumone to make the spell for u, it isnt that hard, so im sure sumone will do it for u