Yup, citrine. The middle one I'm pretty sure is a baked amethyst (also considered a citrine). If they all came together then its most likely all three are baked amethyst citrines. I have an amethyst that looks exactly like the first stone, except purple, so no surprise if that's a baked amethyst citrine. The last one looks a lot like a natural, but it could just have started off as a very light amethyst and somehow received less heat while baking.

Nice stones :)