Moonstone is a Gem who was abandoned on Earth but however, did not side with the Crystal Gems or the Homeworld.
Moonstone has light purple skin and long bright blue hair, and a oval-shaped moonstone on the side of her left arm. She wears a outfit consisting of an above-knee length puffy purple skirt with a blue strip along the bottom, glided with white stars, a crop top with a large oval cut on each sleeve with a wave pattern consisting of colours like purple, pink and light aqua and light aqua tights till her knees. Her feet are covered with dark navy blue ballerina flats. On her hair, she has a purple bow in it's place and also wears purple earrings. Moonstone's eyes are light blue. In terms of height, she is slightly shorter than Steven.
Moonstone is known to be curious and imaginative. While she does not express these sides of her, her curious nature may over take her and would be willing to take the risk if it meant to find out something. Moonstone is also not one of the bravest gems, due to her cautious attitude outside her curious zone. This is shown by how protective and scared she gets when one threatens to smash her gem. She can be quite childish and oblivious to other people's emotions. She is also very sociable and is willing to make a friend when she can. Moonstone is also shown to be easily driven into boredom, due to her long time on Earth. She is also neat and tidy, disliking mess when there is one, but can be quite lazy and will neglect it. She's also known to hold her grudges, as she holds some for humans she had met thousands of years ago.
- Moonstone always has a spoon to suck on in the back pocket of her skirt, only sucking on it when she is bored.
- She got this habit when observing humans for her time on Earth, eventually finding one spoon to do so
- Moonstone, despite not being with the Crystal Gems, has the star emblem of the Crystal Gems gilded repeatedly on her skirt. This may suggest that Moonstone was apart of the Crystal Gems in the past.