Based on the pictures, I have to agree with Tim. Gold does not oxidize, even low grade gold allow (only ever so slightly). What I see is typical of brass. The best way is to go to a jeweler and test the metal on the inside of the scabbard and guard. That way one can determine white metal/white brass from silver.
What is also possible is that the yellowish parts are a type of tarnish on the silver. This would mean age, chemical exposure, and a different alloy mixed in with the silver. This may account for the color on top of the silver even though it is not the color of gold.
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