Opal is nice, I prefer
Opaline, but that's just me.
Opal Athena is hard for me to say.
Opal Rosalie is my fave of those, but
Marietta is pretty too.
Ever thought of using
Opal as a boy's name in the middle name? Who says gems can only be girls names... sorry just being a little silly. I am a writer, i was just being open minded, if you like
Opal for a girl, good for you...