How much is a deep reddish/purple amethyst worth?

I have a very clear, uncut peice of amethyst that is reddish purple and has citrine, powder pink, deep violet , and magenta stripes through it. Its about 3 inches wide and 1 1/2 inches tall, I dont know how many carats it is but i want to know how much it would be worth. I will e-mail you some pictures of it if you want please give me an estimate of how much its worth. Thanx!