Introducng Diamond (ダイヤ, Daiya ) the Main Character

Diamond is Amu's fourth Guardian Character. Diamond represents Amu's desire to shine and be noticed in front of other people. Unlike most Guardian Characters, she is supposedly the most powerful. She becomes an X Egg when Amu dislikes all the changes that were happening in the spring. While collecting X Eggs with Yukari, Utau finds Diamond's egg inside the box. She soon hatches into a X Character. Unusually, she is not shaped like the usual X Character; she looks like a normal Guardian Character, but with a white X-shaped clip covering her black diamond-shaped clip. Because of this, Amu doesn't know Diamond's true name. In the Japanese versions, Diamond's name is shortened to Dia. X-Diamond can Character Transform with Utau, becoming Dark Jewel, however, the transformation does not last very long. When Amu is finally able to prove to Diamond that she does have enough confidence to shine she reverts into her true original form. Together they undergo a Character Transformation, becoming Amulet Diamond. Afterward, Diamond returns to her egg until she sees that Amu "shines again", but secretly comes out as a spirit at times. Diamond is shown to be an air-headed character. In chapter 38, Diamond comes back when Amu "shines". After character transforming and fighting with Ikuto, she, Ran, Miki, and Su combine powers with Amu; becoming Amulet Fortune. In chapter 44, Diamond tells Amu that Ran, Miki and Su have "disappeared" and that she will help Amu find them as her "navigator". Diamond becomes Amu's guide in the Eggs' Cradle in Amu's search for the four colored shards. Coming to terms with herself and the future, Amu accepts the loss of her Guardian Characters and Diamond disappears as well, guaranteeing that the four of them will always be watching over her. In Shugo Chara Encore Diamond and the other three have hatched again and save Amu's catching of the thrown bouquet. When Amu Character Changes with Dia in Shugo Chara Party's Shugo Chara Dokki Doki, Amu doesn't really do much but smile and sparkle, disappointing Ran, Miki, and Su. {{anime voices2|Diamond|Kanae Itō|type=tv}