I'm trying to do the Ranch Challening Quest & got to the Inner Space Shrinking Machine room. I can't find the gems there. I only found two of them and don't know if I need to another room or if the gems are all there.

Would you like a link to the tomorrowland quest answers in the spoilers section?

If you are talking about a player-created quest, then we can't help you because we don't know where the player placed the items at for you to find.

You should go to the Spoliers Section.