1) I looked back at post #31. Even "gold," the tooth looks great. You could definitely leave it shined up an looking proud.
2) It will eventually get some kind of patina, might not stand out as much over time.
3) Wild hair ... if you want to quickly dull the gold color down a bit, you might try "liver of sulfur." It's sodium and potassium sulfide. Smells bad, and not real good for you. Should be available at craft stores or Amazon. When applied to copper (and copper containing alloys?) it turns the surface various shades of dark ... all the way to black. I guess you could experiment with it a bit, and see if it'll end up a greyish shade close to that of the nearby cast iron. And if you don't like the color, you can always polish it off and get back to the original golden hue.