This pebble is so small, it's a peeble! This quest has you pick up four "Tiny Pebbles" but for some reason, one of them is a "Tiny Peeble"! I kind-of like it as a peeble, but I figured I should let you guys know anyway.
Quest: The Sound of Civilized Life
Area: Yanxia
https://i.imgur.com/uMC04lW.jpg