- The Diamond Pet is rewarded after you have acquired 88 Coal from the Christmas maps Winter Wonderland and Silent Night.
- The Diamond cannot attack enemies.
- Gives a greater speed increase than the Skeleton on Treadmill and Turtle on Treadmill.
- Cannot be purchased from the Tavernkeep.
- Stat cap is 800.
- Level requirement is 100.
Patch 7.47c "Diamonds will no longer generate with the running speed stat, it's unnecessary as they tremendously boost your speed anyway."