Diana is one of the Main Villains of Jewelpet, she's a Black Munchkin cat with white paws who can use the forbidden dark magic called Dark Eyes Power and wears a frilly pink waistcoat, a pink bow, and also wears a silver heart-shaped necklace. She's Dian's younger sister, who got sealed by the Four Witches of Jewel Land many years ago due to her foolish acts. She was unsealed during the events of Episode 2 due to the Phantom Thieves, thinking it was the kitten they found. Her mission is to defeat the Four Witches of Jewel Land and rule both worlds by her power. Although she can be snobbish, evil and sometimes jealous to Rinko, her magic however, is strong (which can be distinguished from the black to purple colored paw on the victim), casting it to a human or object in which the Jewel Charms were hiding, which can be broken by someone confessing their weakness. She always lets her minions, the Phantom Herb Thieves to do her bidding on stealing the Jewelpets and collecting them to break the seal that keeps Dian imprisoned. But time and time again, she and the gang failed on getting every single one of them. After the events of Episode 26, the Phantom Thieves betrayed her and Diana has gone solo on collecting the remaining Jewelpets. But in the end, she successfully freed Dian from the Ice Prison. In Episode 52, she channeled her Jewel Power to the Jewel Stick along with the other Jewelpets and defeated Dark Dian, while opening her brother's heart to the truth that Jewelpets and Humans must co-exist in harmony and tell him he has friends in Jewel Land to accept him and Diana. After that, they both changed their ways. She has a fear of Bananas. Diana's name is based on Diamond  and her birthday is on April 20th.  Diana has a black version of the Jewel Pocketbook which she uses to identify which Jewelpet she will get. It was also used to unlock the Jewel Stick along with the one Rinko has.  (source: Wikipedia)

Rinko, a junior high school student, becomes a partner with Ruby, a rabbit Jewelpet, to find the Jewel Charms that were accidentally dropped from Jewel Land and got lost in the world of humans. Since Jewel Charms appear around people in trouble, Rinko and Ruby always get involved in helping them solve their problems. With help from their friends and a good-looking high-level goverment official, they use the magic of Jewelpets to overcome obstacles, and in each episode they find another missing Jewelpet. Meanwhile, Black Cat Diana manipulates a group of petty criminals as she plans something evil to Jewel Land, the homeland of the Jewelpets. (Source: AniDB)

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Special episode included with the Blu-ray box set of the original Jewelpet Tinkle anime series.

The story of the new film is set in Sweetsland, a country next to Jewelland. Ruby and the other Jewelpets are celebrating the birthday of the princess with dancing. However, during the preparations for the birthday party, a mysterious object appears from the skies. In the object is a Sweetspet boy, whose identity is unknown. 
(Source: Anime News Network)

In Jewel Land, Jewelpets, creatures who has the natural ability to use magic lived in harmony with the Witches, attending the School of Witchcraft and Wizardry to learn to use magic with their Jewel Eyes. However for Ruby, a white Japanese Hare whose magic sometimes fail, is appointed to go to the Human World to search for her partner. But when she used the card the magicians gave her, she was sent to the Human World by accident. In the Human World, A girl named Akari Sakura met her on the beach on her way to school. At first, Akari can't understand her due to her Jewel Land Language until Ruby took a special candy so she could speak and understand human language. As the day passes, Ruby knew about her problems and later apologized. A Jewel Charm appeared on Akari's hand and she realized it that she's chosen by Ruby to be her partner. After that, she decided to enter the Jewel Star Grand Prix, on the prize is that any wish that they wanted will be granted. Will she be the Next Jewel Star and her wish be granted in the end? Or I'll just end in one big disaster... 
(Source: Wikipedia)