
In One Piece World Seeker there are several missions you can complete. One of these is the Mysterious Ore side mission which you will gain access to partway through the game. The task of this mission is finding the Translucent Green Gems which you have to search for as you make your way across the island. To begin the Mysterious Ore side mission go to the Crystal Canyon and search for the mission marker, then after you have found it talk to Robin who will task you with tracking down three different pieces of Translucent Green Ore.
1st Translucent Green Gem
After speaking to Robin if you make your way down the main path of the Crstal Canyon you will find the first green gem at the foot of the waterfall.
2nd Translucent Green Gem
If you continue on after finding the first green gem you will eventually reach a giant structure which will have a secluded pond a the very top. If you use Luffy's grappling ability by pressing R1 (RB) whenever the triangular marker appears on the structure Luffy will be able to reach the top. At the top make Luffy jump towards the walled-off pond, aiming for the beach behind the interior waterfall. It is there that you will be able to grab the second green gem.
3rd Translucent Green Gem
To find the final green gem you need to turn around from where you picked up the second gem and use Gum Gum UFO to reach the exit. You will find the last Translucent Gem on your left.
Now that you have all three Translucent Green Gems you just need to return to Robin to complete the Mysterious Ore Mission.
Check out our How to Grapple page to learn more about this special ability Luffy has if you are struggling to reach the top of the structure to get the 2nd Translucent Green Gem.