Garnet is a Persian cat with pink fur, rose pink inner ears and a white muzzle and chest fluff. Both of her ears have two locks of fur sticking out. Her Jewel Eyes are made out of dark pink garnets. For her attire, she wears a red bow around her right ear and a light blue pearl necklace with a dark pink garnet jewel attached around her neck. Garnet's Jewel Charm is octagon-shaped and colored pink. It is decorated with four teardrop shaped garnets in the center arranged into a clover and four round garnets surrounding it. It has white gold lining as well. According to the official website, Garnet is prideful and very hardworking. She loves to boast about her beauty, but is also very bad-tempered about it. In the anime, Garnet is very girly, liking the color pink, cute stuff, and fashion, but she's also sassy, tough, and has a hatred towards bad men. She often lashes out when others are being dumb or things go south. Garnet is often sarcastic and tends to act haughtily towards people she deems inferior, as seen in her interactions with the dim-witted Ruby. But she hates it when someone insults her friends. As the Jewelpet of Love, Garnet's magic allows humans to confess their love and affection to one another and also allow them to be in a relationship with their loved one.

Other than her magic skills, Garnet demonstrates good special skills regarding fashion, knowing which clothing is good for the wearer or choosing a good dress. Sometimes this overwhelms her overall personality. As shown in Sunshine, Garnet also has a good knowledge in sewing her own clothes and works for the Strawberry Café on her part-time job. Garnet's magic skills were in the "Glass Class" ranking, on which her magic can have a success rate of 50%. She earned the Crystal Class in the later episodes in the first series. She can also wield a miniaturized version of the Jewel Stick for her magic, or even with Ruby and Sapphie, to summon other Jewelpets from Jewel Land.