Smoky Quartz has three arms; one right arm and one left arm with two fore-arms stemming from the elbow, a dark mauve complexion, dark bushy eyebrows, and peach freckles on their cheeks and shoulders. her hair is similar in shape to Amethyst's, reaching down to her shoulders; the dark brown coloration and slight curl being derived from Steven, often obscuring her left eye. She's slightly taller than Jasper and have a large, wide build which stems from both Steven and Amethyst's fuller body structure. She has plump lips, a small nose, and a round face.
Like Stevonnie, the outfit is a combination of the individual outfits of her components: Smoky Quartz has a pale mauve version of Amethyst's tank top with a jagged bottom peeking out from underneath Steven's red t-shirt with a yellow star, which is now off-shoulder and stretched out, both of which are now midriffs, along with Steven's jeans, which now resemble jean shorts, and Amethyst's dark mauve boots and black leggings with mauve stars on the knees. The gemstones are located on her chest and navel.
Smoky adopted attributes of both Steven and Amethyst, and as to their trust in eachother, she is a pretty stable fusion and can be together for a fairly long amount of time. She is a rather fun-loving, happy-go-lucky, and carefree attitude, her confidence especially high during times of combat, as she is shown to make jokes even in the heat of battle, though she does have a bit more focus than other Gems do in terms of the goal, though not by much. This sort of confidence helped out Amethyst, who got torn down during her fight with Porath prior to her first appearance.
She has also shown a bit of modesty in herself, Smoky coming to terms that she can't do everything, stating that she's no "deck of cards", and she was fine with just knowing tricks with her yo-yo.
Smoky Quartz is shown to be very agile, despite her large size, evident throughout most of her battles.
Despite being part human, Smoky has a fairly high amount of durability. Her most evident example of this is her fight with the Remorhaz, the creature unable to bite through her, and her even finding it ticklish.