Moonstone (Albite)

Moonstone also known as Albite, was a general for White diamond during the rebellion but was corrupted after the war, once cured, he became a Crystal gem and helped protect Earth from his former masters

History
Moonstone, originally called Albite, was the General of White Diamond and was one of the first gems to come to Earth and start the colony. By the time the rebellion was started, he served White diamond and fought against the rebels with his life. One day he got into a dual with Rose Quartz in which he lost. Asking her to shatter him, she refused and said she had his own purpose.

After that moment, the war ended and multipe Gems began to become corrupt including him. Realizing he was changing, he isolated himself in the Lunar area for 5,700 years were he witness humanity from above in his corrupt form.

One day, Steven and Connie stumbled upon the Lunar Arena and was able to cure Moonstone's corruption. He than joined the Crystal Gems and fell in love with Lapis Lazuli.