|Type||N/A (goes on the Amulet, a Neck Item)|
|Where found|| Card-Jitsu Fire|
The Fire Gem represents the element of fire, and can be obtained after defeating Sensei in Card-Jitsu Fire atop the Fire Dojo, which can only be accomplished after completing the Fire Suit. Obtaining the Fire Gem gives you the Fire Ninja stamp. This gem was first available to members on November 24, 2009, and was the first gem available to players.
The Water Gem represents the element of water, and can be obtained after defeating Sensei in Card-Jitsu Water in the Water Dojo, which can only be accomplished after completing the Water Suit. Obtaining the Water Gem gives you the Water Ninja stamp. This gem was first available to members on November 23, 2010, and was the second gem available to players.
The Snow Gem represents the element of snow, and can be obtained after considerable progress through Card-Jitsu Snow. Unlike the other two gems, you do not challenge Sensei to earn this gem. However, after earning it, you are able to face Tusk in his cave. Obtaining the Snow Gem gives you the Snow Pro stamp. This gem was first available to players on May 23, 2013 and was the third and most recent gem available to players.
- Sensei was the first to have all three elemental gems.
- If you owned a gem, the Amulet floor symbol in the Ninja Hideout, the corresponding element symbol would glow. If you walked on top of the element symbol, it would glow brighter. After the Ninja Hideout was removed and the Amulet symbol was moved to the Dojo, it no longer glows as a result of a gem.
- The gems are not shown on players' images on the Buddy List, nor in-game.