What is the value of a 1979 gold dollar coin?

I'm curious, what would you say is the estimated value of a 1979 gold dollar coin? I understand that these coins are often sought after by collectors and investors alike, but what specific factors would influence its worth? Are there any unique features or markings that could make it more valuable? And, given the fluctuations in the price of gold, how does that affect the overall valuation of this particular coin?