I was thinking it looked female also
Chams don't like a lot of movement around their places of living. It is probably stressing him out. I would move him back to a less busy area.FYI my Veiled is the same color and reacts the same, take him out and he's brilliant and put him in and he's grey. Funny thing is, when he was in a smaller cage he was more colorful. I moved him to a bigger cage and he went grey. The only thing that changed was the location of his cage. It is now in a busier area of the house.