To remove lvl 4 = 100 gems
To remove lvl 5 = 200 gems
To remove lvl 6 = ??? gems
Maybe some have those gems, i dont. Right now i have several lvl 4 gems i cant afford to use. IMHO lvl 4-6 jewels are "useless" since i cant afford to put them on now and remove them later.
It is a big disadvantage for those who NOT use a lot of money. Those who do, can just buy lvl 7 from the start, and wont be "prevented from getting too overpowered".
I am NOT complaining, and i have accepted that i have to keep my lvl 3 jewels until i can exchange them with lvl 7.