- Kaiya (カイヤKaiya?)
- Jewel: Kyanite
- Species: Siamese Cat
- Gender: Female
- Jewel Power: Independence
- Attribute: Magical Blue
- Voiced by: Kanako Sakai
Kaiya is Mint and Marinanne's Jewelpet Partner. She is a brown and tan Siamese Cat who symbolizes independence and wears a tiara. She also wears a necklace shaped like a blue rose. Debuting in Episode 24, Kaiya is a Jewelpet who has a Glass Class ranking in her magic and is aware of Mint's condition while working with Diana, thus, she cannot become independent on her own. Mint abandons her in the same episode but after Mint and the rest of the Phantom Herb Thieves betrayed Diana, they went to her side and Kaiya helped them change their ways for the better. She also appeared in Episode 51 and again in Episode 52, convincing Diana that she needed to lend her powers to stop Dark Dian and save her brother from the dark magic. Kaiya reappears again in Jewelpet Twinkle as the Jewelpet partner of Marinanne. She, Amelie and Ryl challenged Ruby, Garnet and Sapphy into a cooking battle. She appears again on Jewelpet Sunshine on episode 26 on party. Her birthday is on May 15 and her name is based on the jewel Kyanite.