Snowflake Obsidian

Snowflake Obsidian is a member of the Crystal Gems who first appeared in the episode "Change Your Mind". A close friend of Bismuth before becoming corrupted, she was mentioned twice by her in the episode of the same name. She (along with the other bubbled Gems) was uncorrupted by Steven and the Diamonds in "Change Your Mind".

Appearance
Snowflake Obsidian is a tall, bulky, warrior-like Gem. She has a spiky white mane-like structure around her head, shaped similarly to the patterns scattered over her form, which mirror real-life snowflake obsidian. She has only one eye (possibly due to corruption), round in shape, and no nose. Her gemstone is embedded in the back of her right hand.

Her outfit consists of a black breastplate with shoulder pads, shorts in the same color, and boots. Her waist and thighs are uncovered.

Thousands of Years Ago
During the Rebellion, Snowflake defected from Homeworld and became a member of the Crystal Gems. She fought in the war until its very end, when the Diamonds unleashed the Corrupting Light. Snowflake was unable to escape the blast and became corrupted when exposed to the light.

"Bismuth"
Bismuth mentions her friend Snowflake, and later believes that she was shattered during the Rebellion.

"Change Your Mind"
Snowflake is one of the many Corrupted Gems that are healed. After she's uncorrupted, she is seen talking with Larimar, smiling.

Steven Universe: The Movie
Snowflake appears as a background character in Little Homeworld.

Bismuth
Snowflake Obsidian, as a member of the Crystal Gems before being corrupted, was friends with Bismuth. Once Bismuth is first freed from her bubble (5,000 years after being poofed and having missed the rest of the War), Bismuth asks about the whereabouts of some of her closest Crystal Gem friends, including "Snowflake".

Trivia

 * Snowflake Obsidian shares the same gem type as Obsidian (the fusion of Pearl, Amethyst, Ruby, Sapphire, and Steven).
 * This makes Obsidian the second fusion to have a singular gem counterpart. The first is Garnet, with other Gems that are types of Garnet being mentioned (Hessonite, Pyrope, and Demantoid).
 * Along with Carnelian, Emerald, and Spinel, Snowflake Obsidian is the sole individual of her Gem type to be seen in full detail.

Gemstone
Copo de Nieve Снежный Обсидиан