- You may be looking for the film Barbie & The Diamond Castle.
The Diamond Castle is the titular location of Barbie & The Diamond Castle. It is the birthplace of music, and every time a new song is sung anywhere in the world, a diamond appears on the walls. This mythical place is home of good spirits of music, known formally as the Muses of Music, children, Glimmer and several Pegasus.
Dori, Phaedra and Lydia were friends at first, and they took care of the Diamond Castle. However, Lydia wanted the Diamond Castle for herself and wanted to be the only Muse, so it was hidden away, this time completely invisible from Lydia at the bottom of the lake. Unfortunately, Dori and Phaedra were turned into stone statues and Melody was trapped inside the Magic Mirror, until two girls, Liana and Alexa, discovered a new friend when they met her.
| Barbie & The Diamond Castle |
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 Quote: "Friendship is the true treasure." Characters: Alexa | Barbie | Dori | Glimmer | Ian | Jeremy | Liana | Lily | Lydia | Melody | Muses of Music | Phaedra | Slyder | Sparkles | Stacie | Teresa Objects: Magic Mirror Locations: Diamond Castle | Liana and Alexa's Cottage | Mansion | Valley of Flowers Songs: "Believe" | "Connected" | "Double Vision" | "Two Voices, One Song" | "We're Gonna Find It" | "Wonderful Me" |