[unknown] this is the most expensive dyeing event ever 😖 total gems you need to unlock all items are 3071 gems. You need 28 paints which costs 1260 gems ( you get 2 free so take away 90 gems so 1170 gems)!
So total 4331 gems or 4241 gems with 2 free paint. This is assuming you have got all the dyeing materials too.