This is one of eight quests in the Lost Village of Kugup that you will need to complete in order to unlock the Froglok race. To reach the Lost Village of Kugup you must do a series of quests in your home city (see related quests).
Pikspoh asks you to find a channeling gem. Head to the mines and watch the guy mining and you'll see a small rock appear now and again. Pick it up.
You must then wash it. You can do this at the keg at -63, 14, 154 . Use the keg to wash it.
After this give the gem to Pikspoh.