The amount of gold that humans have discovered so far is limited.

The total amount of gold on Earth is roughly fixed.
About 200,000+ tons have already been mined.
The remaining amount that can be extracted is decreasing, and mining costs are rising.
This is why gold has a core logic:
Scarcity is certain.
But it's important to understand one thing:
"Limited" does not equal "will not increase."
Technological advancement, deep-sea mining, and asteroid mining could all potentially change the supply.