After taking the small Goron to Castle Town (see our guide for more on this Force Gem) you eventually be able to strike up a conversation with him that goes something like this: He tells you he is discouraged by city life and spent all of the money his grandfather had given him. Choose to tell him to "Cheer up." The Goron child will perk up and then the game will give you 2 more choices. Pick the top one. The young Goron will thank you for the pep talk, and give you Goron Amber.