|Voice Actor||Jun Fukuyama|
|Eye Color||Dark gray|
|Fur Color||Light blueish-gray (fur)|
White (paws, fluff)
|Family||Diana (younger sister; JP1)|
|Magical Ranking||Crystal (JP1)|
Decoranain member (JPKD)
Show host (JPH)
|Magical Item||Jewel Stick|
Dian is a light blueish-gray Maine Coon cat with Jewel Eyes made of dark gray obsidians, as well as white paws and a white fluffy chest, and a hair tuft on his forehead. He wears two gold earrings on his left ear and a gold pearl necklace with a black orb attached.
In the first series, he wears a dark blue, purple, and red Jewel Cloak, which represents his mastery over Dark Magic.
As Dark Dian, he sports darker gray fur with black stripes and white paws, and has grotesque wings on his back. His claws become longer and sharper and his tail resembles his flying broom. His eyes are colored yellow with red sclerae and his necklace becomes a dark-themed cross.
Charm FormDian's Jewel Charm is shaped like an octagon and is colored navy blue, it is embedded with a dark gray cross, with an obsidian placed in the center of the cross. It is decorated with gold lines in the corners, filled with bright jewels.
In Jewelpet, Dian is evil and calculating. He used to fight for the Jewelpets' freedom because he believed humans abused them. That changed when he was imprisoned by Jewel Land's leaders and he became obsessed with revenge, forgetting the ideals he strives for.
In Jewelpet Twinkle, Dian is mature, confident and wise. He often acts as a big brother figure to the other Jewelpets. Some characters think his muteness is reflective of an aspect of his personality, but this is not the case.
As the Jewelpet of Self-control, Dian's magic spells can allow others to control one's thoughts very efficiently; especially when in difficult and hard-to-comprehend situations.
He was also the only Jewelpet able to revive a Jewel Charm alone in Jewelpet.
In Jewelpet, he is a Dark Magic user and the main antagonist in the second half of the show after his sister Diana frees him from his prison. Thousands of years before the show, he started a rebellion against humans, because he thought they didn't deserve the Jewelpets' goodwill. He was defeated by the Four Great Magicians and imprisoned in ice. When he is released, he plans to avenge himself. He turns into a human named Andy Samael (アンディ・サマエル Andi samaeru?) in order to seduce Rinko into handing him the Jewel Stick. He also forms the Jewel Eight. At the last few episodes, he turns into Dark Dian by losing his Self-control and was helped by all of the Jewelpets, eventually turning to the side of good along with his sister.
In Jewelpet Sunshine, he is a popular idol singer who had stained his costume and meets up with Garnet who fixes it for him. He later dates her for a while, after she gives him advice about his recent girlfriend who he felt did not like him. However, he apologizes and leaves Garnet to get back with his ex-girlfriend Diana, after she tries to tape her eyes shut.
In Jewelpet Kira☆Deco!, he is a member of the Decoranain's elite Shitennou. He enjoys playing card games with his victims, and upon his victory, he imprisons them in cards to be used in future games. He also loves his Kotatsu which he personally names "Angelina". In episode 35, he challenges Retsu and Angela to a duel upon sealing everyone in Jewel Town as cards. He eventually loses and flies away on his Kotatsu; vowing for revenge.
In Jewelpet Happiness, he is the host of a cooking show centered on vegetables. He has a keen sense of smell to help him. However, he loses it by the Red Moon. Upon getting it back, he forms his Magic Gem with everyone who helped him.
- Main article: Dian/Image Gallery
- Dian's jewel motif is the obsidian, an igneous rock popular as material for tools in ancient times, and still renowned for its sharpness.
- Dian and Diana are the only Jewelpet characters who were born as siblings (this is only true for the first season's continuity, however).
- Before Jewelpet Magical Change, Dian was one of the three Jewelpets to have a human form, the others being Coal and Granite.
|Magical Red||Ruby • Garnet • Rin • Ryl • Kohaku • Titana • Sango • Nix • Alex • Brownie • Jasper • Lolip • Rosa|
|Magical Blue||Sapphie • Luna • Yuku • Aqua • Kaiya • Opal • Amelie • Lapis • Io • Topaz • Charotte • Larimar|
|Magical Green||Peridot • Chite • Prase • Rald • Flora • Tour • Milky • Nephrite • Tata • Kris • Angela|
|Magical Black||Diana • King • Dian • Labra • Granite • Coal • Luea|