This quest is given to you by Radcliff after you have taken control of the Battle Tower.
It involves you heading to the end of Orobas Fjords and find a chest on a couple of rocks in the water. Open this chest and take the gem inside.
Two Goblins will appear, Raj and Khan.
Here you get two options:
- Trade them the gem for a pair of Malachite Gems, however this option will deprive you of your chance to upgrade your workshop.
- Kill them and take the gem for yourself so you can upgrade your workshop.