Hi, No need to have 3 potions, here is the spoiler! https://ibb.co/xKPg57q1
No, because like I've been trying to say this whole time, the gems fall into the acid before the third rock, and even if I use the "ctrl+direction" move to try grabbing the gem without going into the acid, it still kills me. The only way to get that gem is to put a third rock in the acid pool before it falls.