It's important to understand that not all silver is bright and all copper or gold is soft. That is an old wives' tale perpetuated here, in magazines, in reviews, and in other audio forums.
Far more important are the purity of the conductor, geometry of the conductor, and the dielectric.
Additionally the components of the system play a substantial role in any cables' "performance".
I could have you sit in front of a system and listen to 6 pairs of interconnects (or speaker cables) and you'd undoubtedly hear a difference among them. However, there's no way you could identify (outside of guessing) the conductor(s) used in each cable.