Jewelry is pretty. That's why people want it. Sure. And gold does not corrode, so it's more valuable than iron, or tin. But stainless steel jewelry also exists, and costs fraction of gold jewelry.
Being usable for jewelry or being pretty has some value .. but it's not why gold is expensive. Gold is rare and non-fungible. That's it's value. Bitcoin has the same properties.
As for things increasing in value by work .. well of course, it costs something to make them. Or they are done by skilled people, who are rare, and have limited time to do things. Btw. Bitcoin too costs to create.
I could see "intrinsic value" as something which most people would find valuable .. being pretty is that. But being rare and non-fungible is also that, and for gold, and jewelry, the major component is this.