I have a cousin named Augusta, she gets compliments on it all the time :) We pronounce it the Italian way, so I don't know if it sounds very different in English (?). She's called Gusta and Gus for short.
Augusta nicknames vary a lot, and I think Augusta is a cute name for a young girl, and for a grown-up it sounds very sophisticated, so it would be great for someone's whole life! Just saying.