Spinel has a pink complexion, magenta eyes, a small pointy nose, and cerise hair that is styled into a pair of spiky pigtails. She also has three black lines underneath both of her eyes reminiscent of running mascara. Her clothing consists of a plum-colored top, puffy pointed hot pink sleeves, puffy rose shorts, hot pink wrist-length gloves, white stockings, and a pair of rose knee-high pointy boots.

Her gemstone is located in the center of her chest, cut in the shape of an upside-down heart.