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Just out of curiosity, what does gold sound like on a metal detector? I know it varies on different detectors but I have never been able to tell on mine. The one I have is a simple bounty hunter quick silver with ID targets. It was my very first and the only one I have for now. The led ID screen shows iron, aluminum/zync 5 cents and coins. Once it finds something in the ground, it beeps, giving either a high or low tone. The ID can be misleading because half the time it doesn't turn out to be that object. Its a good detector and it has served me well but i never figured out how gold comes up on it.
Too many variables in your question. You're talking about jewelry (as opposed to nuggets), right? As such, that would be alloyed gold (as opposed to pure gold, which is a high conductor when pure 24k).
And also when you say, "what does it *sound* like?", are you referring to the TID conductivity reading it will give? (ie.: foil, tab, nail, penny, etc...) ? Or are you truly referring to "sound", regardless of TID meter reading?
Thus you need to be a little more specific in your question.
For starters, if you meant "sound" (irregardless of TID), then I'm afraid to tell you that gold has no specific "sound", at least not so far as sounding different than something ELSE, that is

We all sure wish it did though! Because if it did, we'd all go out and look for that specific sound, and pass all other sounds, haha
But assuming you meant gold alloyed (10k, 14k, 18k) jewelry, and assuming you meant conductivity range, even then the answer is going to be: It depends on the size of the particular piece of jewelry. Because the conductivity of an item not only involves the actual composition of the item (copper, gold, silver, aluminum, etc...), but also the SIZE of the item. So for example: A small solitair fine thin ladies ring will read down into the foil ranges (very low), while a men's standard band might read around nickel. A thicker fatter band might read in the tab range. And a super bowl ring might read up at penny/dime or whatever. So again, no set "sound".
Size per size, aluminum and gold share the same conductivity ranges, so you can test various wads and snippets of aluminum cans and foil, and that should answer your question (when it comes to alloyed gold jewelry).