Gold is another store of value, but not that unstable. It reached 2000$ recently and was above 1000$ for many years. Those who invested in gold back in 1900 would have made a great choice since it costed only 20$ back then if I'm not wrong. (Although dollar was way more strong than now)
Bitcoin can lose 500$ within one night. Gold can't. Why that?
Volatility of bitcoin is the best feature of it. That's why many people want to invest in bitcoin to earn much bigger than a gold in just one night if they are lucky. But Gold is a safe investment compared to bitcoin that you can earn big but if you don't have knowledge about it you will also loss big.