Gold is much rarer(harder to find, and harder to refine into metal) than aluminium.Infact you are wrong gold is so expensive because of the price of the chemical reaction needed to make it
The current run-up in gold prices means a lot of coins are worth more for their metal content than for their value to collectors. You have to do a lot of homework and never overextend...
Gold is never an essential thing. People like us made it so essential by giving more investment. If gold is that much needed in terms of investment don't we people think investing in diamond is a lot...