why would gold mean anything now
-It's an excellent conductor of electricity and is widely used in electronics
-It's used in the field of healthcare to treat certain diseases and conditions
-Used in dentistry until the mid 1970s
-Used extremely extensively in aerospace design, especially in areas like rocket, satellite and other extra-terrestrial vehicles
-Pigmentation in glassmaking
-Etc.
Almost all commercial non-jewlery uses would be reduced to nothing post-apocolypse. It would not be NEARLY as valuable.