Peridot all the way. I was born on the last day of August, just 10 minutes away from September 1st. I even have a peridot ring but it doesn't fit me as I have gained some weight
My birthstone is sapphire. It's nice – usually sapphires are blue, and I often consider that my favorite color. (There's also a Wizard101-related birthstone thingy that I won't even bother to mention...)
Pearl, Alexandrite, and Moonstone. I actually didn't know Alexandrite and Moonstones were associated with June births, but I'm pretty happy. I usually detest pearls, though I'm not sure why. If I was to chose, Alexandrite is my favoured of the three.