Upload & Sell: On
My first instinct says that your lighting is too harsh and that you need to pay much closer attention to what is reflecting in your subject. Even comes down to very subtle angles of the pieces and how they reflect the light. It feels like the highlight areas in the gold, while not blown out completely, are too white. Read the RGB numbers and you'll see that. In addition, the background is not white, which is distracting, and if you're going to put them on a white background on a web site, it will be even more so. I think that your Levels adjustment, whatever it was, has also added perhaps more saturation than you anticipated. While these images do feel "gold", they also feel a bit hyper saturated, a little too gold.