Marble is a natural product, the color cannot be guaranteed, nor the shade of the veins. The color of marble may vary from one slice of marble to another. Each piece of marble is polished by hand, (see how to make marble). Assembly is very simple, thanks to the two finned pegs provided, in any support. (see assembly instructions). The flanges that decorate the marble piece have a quality finish. In fact, polished collarettes and pearlescent collars have a layer of UV-resistant varnish, thus avoiding the oxidation of the mechanism.