Garnet is a Persian cat Jewelpet embodying love, distinguished by pink fur, a white muzzle and chest fluff, and rose pink inner ears. Her eyes consist of dark pink garnet gemstones. She typically adorns a red bow on her right ear and a light blue pearl necklace featuring a dark pink garnet jewel. Through Magical Change, her human form manifests as a teenage girl boasting long pink curly hair secured by a red ribbon, wearing a peach vest, black coat with a white collar, a white miniskirt with a scarlet belt, and long black boots. Garnet's personality blends girly passions for pink, fashion, and cuteness with a prideful, sassy, and occasionally hot-tempered nature. While diligent in work environments, she reacts harshly to perceived insults or foolishness yet remains fiercely protective of friends. She openly dislikes "bad men" and exhibits sarcastic or haughty attitudes toward those she deems inferior, notably in her dynamic with Ruby. Despite symbolizing love, she often remains oblivious to romantic affections directed her way.

In *Jewelpet Kira☆Deco!*, Garnet lives as a socialite in her family's villa, leveraging her aristocratic background. She aids the KiraDeco 5 in retrieving Deco Stones to avert eternal darkness. When the team is imprisoned in Jewel Land, she specifically bails out Blue Knight Ozaki due to finding him attractive, appointing him as her head butler. This action results in her dismissing her longtime sheep butler, a dismissal exploited by the antagonist Coal to corrupt the former servant. Garnet develops romantic feelings for Blue Knight, culminating in a three-round duel against Opal (cooking, fashion design, jewel gathering) to win his attention. Her Jewel Pod, essential for magic, is lavishly decorated with jewels reflecting her persona. By the season's end, she fires Blue Knight to motivate him to protect women globally, gifting him an earring speaker as a farewell present before his return to the human world, establishing an interspecies romantic subplot central to her arc.

Across the franchise, Garnet's background and development vary significantly. Her origin involves transformation into a Jewel Charm in Jewel Land and scattering to Earth. There, she initially refuses Minami Asaoka as a partner due to Minami's sweaty appearance before eventually partnering with her and using magic to aid Minami's romantic confession. In *Jewelpet Twinkle☆*, she partners with Miria Marigold Mackenzie, offering comfort during Miria's parental absence. *Jewelpet Sunshine* depicts her as a Sunshine Academy Plum class student working part-time at Strawberry Café while pursuing acting. She experiences heartbreak with Dian, later prioritizing her career by starring in Masago Kuroda's film and rejecting his romantic confession. The epilogue shows her achieving fame as an actress alongside Masago as a colleague. *Jewelpet Happiness* features her managing Jewelpet Café Happiness, highlighting her diligence. In *Lady Jewelpet*, she mentors tomboy Mizuki resisting Petite Lady training. *Jewelpet Magical Change* reduces her role to assisting Nene with fashion advice.

Garnet's magic focuses on love and relationships, enabling humans to confess affection or forge romantic connections. Initially ranked Glass Class (50% success rate), her magic elevates to Crystal Class later in the first series. She wields a Jewel Stick, Mini-Jewel Stick (for group summoning incantations with Ruby and Sapphie), Jewel Pod, and later a Jewel Pad or Jewel Watch depending on the series. Key incantations include "Puru Puru Prism Jewerhythm! Garnet Jewel Flash!" for individual spells and "Puripuru Puropuru Puriphony! -Jewelpet Name- Jewel Return!" for summons. Beyond magic, she possesses expertise in fashion design, garment selection, and sewing, skills demonstrated in *Sunshine* through handmade clothing and café work. Interpretations of her gem power vary: love (original series), beauty (*Kira☆Deco!*), femininity (*Lady Jewelpet*), with official materials defining it as "Love luck: make your efforts bear fruit."