My experience is that low cost silver interconnects tend to be harsh and bright. As you move up in quality that completely disappears. For instance I have had a set of real Nordost Odin 2 on my system and they were not even remotely bright or harsh... they were simply stunning.
I spent several years (a couple hundred hours) back in the 90's comparing in detail a host of interconnects. My conclusion was that inexpensive interconnects sounded like their metal... copper, silver coated copper, or silver. But as you got into audiophile interconnects that distinction went away. Obviously a tremendous amount of design and testing goes into audiophile cables and they use the many different materials and designs to achieve their sound characteristics.