Basic Information:
Amethyst is the second youngest of the crystal gem, and is the only one (except for Steven) who was made and emerged on Earth. Amethyst is loud, impulsive, and a little ill-mannered: she is the only crystal gem who appears to find pleasure in eating despite having no need to, and is a rather messy eater.

Out of all the crystal gems, Amethyst is the closest to Steven: he views her as a sister rather than a mother (unlike Garnet and Pearl), and she was the first gem he managed to fuse with.

Species: Gem (Quartz)

Appearance: Amethyst has purple skin, long/scruffy lavender hair, and a purple amethyst gem located on her chest. she wears a white tank top, cut roughly at the bottom, dark grey leggins with purple stars on the knees and purple boots. Her eye colour ranges from black to dark purple depending on the scene.

Fusions: Sugilite (Amethyst/Garnet), Opal (Amethyst/Pearl), Smokey-Quartz (Amethyst/Steven) and Alexandrite (Amethyst/Pearl/Garnet)
Weapons: A duel ended black and purple whip that can be set on fire when cracked
Abilities: Spin dash
Relations: None
Previous Forms: 
 

Trivia

According to Rebecca Sugar, Amethyst's room in the temple is the closest to her room in real life