Hey, man... I'm not trying to stir up any feuds or anything. After reading that post on Gallifrey Base (which I now see that you were a contributor to) I started going through to find it for my own curiosity. I see that the same post prompted CT to do the same.
I just looked closely at Turn Left and it looks a lot more like a cream color to me, under night setting lighting, but I could be wrong. The lighting in that scene would be inconclusive no matter what color the thing were.
I mean, I'm not talking about the ridge shape or the spacing on the windows of the emitter head or some tiny detail that only the most eagle-eyed RPFer would notice... I'm talking about the color of a good 70% of the piece. And this is the place to come for these answers. I addressed you because you flat-out told someone they didn't know what they were talking about when they mentioned the color. I assumed that meant that you had some hard evidence to the contrary, because you seem to be a generally nice and helpful guy.
Now, I'll happily go through looking for a scene where I can conclusively tell that the sonic is Gold if you don't have any well-lit examples that you can offer, because I'm not claiming to be or trying to prove that I am right about anything. Nor am I trying to prove anyone wrong. I'm looking for the truth.
So far, none of the shots I've seen can be chalked up to lighting alone, because the sonic is often in the same shot as brown and blue (or blue and rust) material who's color is very familiar to us all and it looks fine.
If the gold was used, I'll find it. At the moment, if given the choice, I'd definitely go with purchasing a gray one.