"The Order of Whispers rewards those who fight valiantly against the demons within these realms. If you can show me proof of your deeds by bringing me one of each of the four gemstones that are found in the regions through the neraby portals, then I will reward you with a Coffer of Whispers."
I would like a Coffer of Whispers. Take 1 of each of my gemstones.
Word of Caution: the Coffer of Whispers turns into a random item, which can be of very low value compared to the value of the gems required to acquire it.