Phantom Hourglass Power Gems
Below is a listing of all 20 Power Gems that Link finds on his quest. When Link has collected 10 Power Gems he can restore a portion of Leaf's power. In order to do so, he must take the gems to Spirit Island, which is a hidden Island located just south of Molida Island. If Link has collected all 20 of these gems, he can take them to the spring at Spirit Island to fully restore the power of Leaf. The 20 Power Gems are listed in roughly the order they become available to collect.
Power Gem #1
Location: Isle of Ember
Conditions: Complete the Temple of Fire
After completing the Temple of Fire, speak with Astrid and she will give you the Power Gem. This is one of the few Spirit Gems in the game that Link is required to get.Power Gem #2
Location: Cannon Island
Conditions: Complete the Temple of the Ocean King Part II
Enter the cave found on Cannon Island and make your way to the southeast corner of the map. Here you’ll find a cracked wall and you can blow this wall up with a bomb flower. You’ll have to be quick as it is quite a distance away. Beyond the wall you will find a treasure chest containing the Power Gem.Power Gem #3
Location: Isle of Gust
Conditions: Reach the Northwest Quadrant
While traversing the Isle of Gust, you will reach an area just north of Linebeck's Ship, along the western shore, where you can dig up a bunch of geysers with your shovel. Dig up the soil spot here and ride the geyser to the higher platform. Open the treasure chest found here to get the Power Gem.Power Gem #4
Location: Temple of Wind
Conditions: Reach Floor B2 of the Temple of Wind
Found in the large sandy room on Floor B2 of the Temple of Wind. Carefully avoid all the Sandworms and open the treasure chest at the west side of the room to get the Power Gem.Power Gem #5
Location: Mercay Island
Conditions: Collect 500 Rupees
This gem is available for purchase at the Mercay Island Shop from the start of the quest. While you can buy it immediately once you have the rupees, it is usually best to wait until the mid-game when rupees are a bit more plentiful.Power Gem #6
Location: Mercay Island or Mailbag
Conditions: Complete the Temple of Wind
After completing the Temple of Wind, return to Mercay Island and speak with Oshus and he will award you with a Power Gem. If you don't speak with Oshus immediately, he will eventually mail you a letter that the Postman will deliver.Power Gem #7
Location: Mercay Island
Conditions: Acquire Bombs
Just southeast of the Temple of the Ocean King, there is a cracked wall that Link can blast open with a bomb to reveal a cave. Inside you can jump over to a platform with a treasure chest that contains the Power Gem.