The price of gold can fluctuate on a day to day basis or even a minute to minute basis depending on the market for the gold.
Right now 1 gram of gold is worth around $42.00 so not all that much money but still the gold is worth more than other precious metals.
Gold can be a good investment but you must watch the gold market often enough and then when the gold prices get high enough to make a profit then it would be time to sell your gold.
My sister invests in gold and watches the market and sells gold when it's at a high price which can take a few years but she does do good buying gold low and selling it high.
So investing in gold can be worthwhile and make you rich or at least half way wealthy and it can build you a nice retirement fund.