Maybe someone can find GM documentation that specifically describes 1952 wheel colors (Brad might have a Truck Data Book). The 1953 TDB does not refer to wheel color - 1952 and 1953 were had similar Korean-War-influenced specifications when it came to trim and body colors/finishes.

Presumably, you have a Chevrolet truck (not a GMC)?

The color would most likely have been black (a semigloss black, similar in gloss to the running board black); or, the wheel color might have been the body color.

The lug nuts were most likely cadmium/nickle plated.