It was originally in the possession of Princess Ava, but has shattered into two halves. The halves were then each in possession of Eva and Kate. Eva tried to get the other half from Kate, so she would become the queen of the Pocket Kingdom.
Its powers include allowing people like Kate to understand Magic and the other pets of Pocketville and to allow Kate and Magic to travel from the Big City to Pocketville and vice versa.
The words are from the Big City to Pocketville and vice versa are -
Kate - "My puppy and I, together forever. That's all that I want."
Magic - "Katie and I, together forever. That's all that I want."
- The Friendship Heart resembles a ruby.
- According to Claudia, many sources have claimed that the origin of the Friendship Heart was from a star, and that the jewel fell from the sky.
- It's revealed by Ava herself that she made an oath to the jewel's power in Friendship is a Treasure.
- In the episode "Kate's Birthday", the jewel is said to glow when Princess Ava is near.