Aventurine is a young man with sandy-blond, medium-length hair and magenta and cyan eyes with black slitted pupils.

His outfit consists of a dark green, gold-accented, high-collared dress shirt with a chest window in the shape of a spade and a black choker around the collar, over it a dark blazer with gold lining and buttons unbuttoned on his chest area, along with a long dark overcoat with a fur trim which has roulette wheel detailing on the back and sleeve cuffs rolled up near to his elbows. 