He is a quiet, well-spoken, respected diamond. He is a black diamond and one of the rarest types, so he is worshipped. He is observant and stubborn when taking orders, preferring to quietly act than order aloud. He is a towering 15'5" Black Diamond gem with an yet elegant appearance. His body is tall, lean, and lightly muscular, with broad shoulders, a defined torso, limbs, and slender hands. His skin is pale lavender-gray, contrasting with his purple-black hair. His hair is thick, tousled, and layered, with straight bangs and a braid trailing down his back. Two, white horns rise from his forehead, accompanied by pointed ears. His face is angular and refined, with high cheekbones, a narrow jaw, and sharp features. His icy pale-blue eyes are narrow and upturned, giving him an intense gaze. A dark gemstone is embedded in the center of his forehead. Dark markings decorate his face and body, adding to his otherworldly appearance.

White Diamond is the highest-ranking and oldest Diamond. She is a perfectionist, controlling, and adores Black Diamond. She is an immense White Diamond, standing at 89'8", making her overwhelmingly tall and majestic. Her appearance is white and silver, giving her a luminous, otherworldly presence. Her elegant face has large pale eyes, delicate features, and a calm expression. Her long, straight hair flows behind her like a veil. An elaborate crystalline crown of pointed shards surrounds her head, framing her forehead diamond. She wears a magnificent floor-length gown with a celestial design, featuring dark, star-filled fabric covered in constellations and tiny gems. Translucent glittering layers form ruffles along the sides and train. A large diamond-shaped gem rests at her chest, surrounded by ornate jewelry and a crystalline choker. Her enormous train spreads behind her like a living constellation.

She is known to shatter gems when they step out of line—she is the mourning Diamond because she is so blue. She is kind to the Diamonds, but anyone below her gets manners, not respect. She is understanding but can be full of herself without realizing it, and she is kind to Black Diamond. A towering Blue Diamond at 43'1", she has a deep blue palette with luminous cyan highlights. Her long, refined face has expressive eyes, thick lashes, a narrow nose, and small dark mouth. Her diamond rests on her chest. Her pale-blue hair is long, voluminous, and curled around her face and shoulders. A huge dark-blue hood surrounds her head. She wears a massive floor-length blue gown with wide sleeves, layered fabric, a lighter blue sash, and a large flowing bow with teardrop decorations. Her outfit trails behind her, giving her a regal, graceful appearance.

She is the main colonizer, strict, perfectionist, rude, and constantly busy. She snaps at Blue for mourning the gems she shatters, seeing her as weak, while Yellow shatters them without hesitation. A towering Yellow Diamond at 48'9", she radiates a powerful, regal golden-yellow presence. Her sharp face has narrow golden eyes, strong brows, a pointed nose, and a firm expression. Her sleek, angular golden hair has a tall pointed section like a flame or crown. She wears elaborate golden armor with layered, gem-like shoulder plates, a high collar, diamond details, and darker golden mesh beneath. Her diamond rests on the back of her hand, while her lower armor spreads like a structured skirt with pointed plates.

She is around 6'9" with a striking, mysterious appearance. Her dark complexion, long black hair, and shadowy clothing create a dramatic silhouette, while her unusual forehead gem adds to her distinct look. She is quiet and keeps to herself, preferring secluded spaces to think or work undisturbed. Creative and intelligent, she has a sharp mind and imagination that lets her approach problems differently. Though reserved, she notices far more than she lets others realize.

He is the tallest and most refined of the four, standing around 8'6". His body is slender and elegant, with long limbs, narrow shoulders, and a delicate silhouette. His pale, pearlescent skin contrasts with his fluffy hair, while his sharp features give him a pristine appearance. He carries himself with perfect posture and precise movements. Respectful and obedient, he strives for perfection and adapts quickly, though his perfectionism can make him controlling and particular.

She stands around 7'3" with a soft, elegant appearance, slender frame, and flowing pale-blue features. Her long, light hair and gentle features give her an ethereal look. Quiet and soft-spoken, she rarely raises her voice and listens before responding. Extremely obedient and understanding, she is patient with others and quick to notice emotions. She is highly talented in artistic and delicate tasks, preferring to express herself through her abilities rather than words.

She stands around 8'0", with a slim, graceful frame and bright golden appearance. Her hair and pearl-like features have warm yellow tones, complementing her expressive face and confident posture. She moves with theatrical confidence, rarely hesitating to speak her mind. Cocky, sarcastic, and cunning, she enjoys teasing others and taking control. Beneath her stubborn nature, she is fiercely loyal to those she genuinely cares about.