It's not only the colors but the size of the Veil that makes me think it's a female, does it have that spur like in the link I gave you? It would be highly visible by this age. It's a bump that sticks out on the back of his back feet. You really need to be sure so if it is a female you are prepared for her to lay eggs. Veileds lay eggs without being mated so you have to be prepared.