What are some unique and pretty girl names?

i was thinking about going with like, a birthstone name (ex of birthstones:ruby, pearl, amethyst, garnett... etc), or a flower name (ex of a flower name: rose, lilly,...etc), or a color name (ex of a color name: scarlet, viola, azzurro, etc...).....i might go with Viola (means purple in Italian) but what would be a nickname for Viola? thanks for the help!