Prehnite has an appearance very similar to that of the Crystal Gem Prehnite, as she has a yellow and green color scheme with four eyes, four slim arms, a thin and long torso, and long legs, however she does include an extra mouth that’s lacking in the Crystal Gem one. Her skin is yellow-lime and she has three narrow eyes with one of her gemstones covering the fourth one up, with bushy eyebrows on the top pair. Her nose is pointy and she has two small and angular mouths that have undefined lip. Her hair is faded lime green and is swept to the side and is somewhat boxy. Her top pair of arms connect to her shoulders while the lower pair connect to her waist, and her legs are slim too with small flat feet. Her gemstones are on her upper left eye and her forehead, and they are lime in color.
She wears a dark green bodysuit with curved green shoulder pads. Her four arms all have mid forearm length gloves, which are dark green. She has a star design on her chest and she has a triangle on the lower half of her bodysuit. Said bodysuit ends at her upper thighs and her legs are bare. She wears long green socks with dark green ballet flats with yellow toes.