As you attempt to stay out of the reflections in your photographs, it is important to wear colors that will blend with your surroundings as I mentioned about shooting the Christmas ornaments in the window of Neiman Marcus.
For instance, I wore a red shirt one day and in image review I saw a brilliant red reflection in the product! Your face may be well hidden but be careful to also hide bright colors.
While this is a negative for color in reflection, this brings up something I often say with the phrase “Think outside the box”. If a bright-colored shirt appears in reflections, why not learn the effects of using black, white and gray cards?
Gold objects will brighten when reflecting light colors like white and pick-up richer tones when reflecting black. Your purpose will dictate which color fill card should be used, so outlining colors to products will put you back into a box more than helping you out of one.
As the reflective object is exchanged with another of a different color tone, the fill card color may also change. Keep your purpose in mind and use the proper color of fill card.
Engraved surfaces have better contrast reflecting one color over another, and while I have my opinion of which color it is, another viewer may see the engraving better with another. If I see the engraving plainly in both reflected colors, I will defer to the other viewer, however this gives reason to pursue other options for better visibility for all viewers.
For creative shooting, perhaps you want bright and unusual colors! Just because colors outside the grayscale are not used in product photography does not mean it is “taboo” or even unacceptable in your form of art, thus your purpose being my qualifying phrase.