In a SHFT environment if you have a gold coin people are going to think you have more (coins/bars) when you go to cash it in. You may look prepared (because you are) and may give off mixed messages or raise suspicion at the very least.
However if you have a bit of jewellery or broken bits n piece, I'd imagine few would question you where you got it from, when the time comes to sell or trade it.
Thus it would attract less attention. Junk silver is not bad either in terms of 'finding' a few coins. I think think that looking desperate when parting with jewellery will leave people thinking less and there's less chance of "there's more where that came from".
Personally I think having a mixture of bars, coins, junk and a little cheap jewellery is the way to go if you are an 'event planner", like choosing the right tool for the job (or trade in this instance).