Sulphur

Crystalline sulphur is said to be a prison-hardened criminal that has been arrested for shattering and a false accusation of attempting to hack the army station of topazes. In reality, she is one of the chosen gems of Black Orlov. She has been chosen by Black Orlov to do what he cannot do- to see what he himself cannot-to see who is guilty and innocent. She had been created out of volcanic gases, magma and ash and water from stalactites. This has given her the powers to turn into mist that poisons anyone who breathes it. She is blind, but has a keen sense of hearing and the ability to sense auras. Her weapon is a classical sword with a long, flat blade, that has been sharpened with the Stone of the Guilty that sends out a painful jab whenever she has killed someone innocent. Her gem is on the face of her hand, and it is only a source of power for the sword. Her actual gem is under her bandage around her eye sockets, in one of her eye sockets, as a painful and sad reminder that she will be blind. Even though she has been around since the humans invented it, she has been caught several times both by humans and gems, making her weaker but still stronger than most gems. Her abilities are fly, turn into gas, catch on and control fire, see auras, super speed and super strength. Her signature attack is turn into a monster made of gas, then solidify in a gigantic version of herself, slashing with her sword.