Use this as help if you don't know what the birthstone for each month is https://www.google.com/search?q=birthstones&safe=active&rlz=1C1FLDB_enUS526US526&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiLhPCX4JTcAhXmYt8KHYJbDzkQ_AUICigB&biw=1280&bih=685#imgrc=-EcbuQIVJqTGTM:

I'm not a Ruby, nor a Topaz, nor a Diamond, nor a Peridot. I could be a Tourmaline, Zircon, Sapphire, Alexandrite, Emerald, Garnet, Amethyst, or an Aquamarine.