Jewelry is worthless

Useless shiny metal and stones that only serve to make you look rich. Why? Because other people pay money for it. But it's only "worth" money because other people think it's worth money. A power drill is more useful because it can actually do something. Jewelry doesn't do anything. Diamonds are really abundant, but they are only artificially propped up by diamond sellers. They will charge you like $1k for something, but then if you want to sell it back, they'll only give you a fraction of the price, as a kind of consolation prize, because even they know it's worthless. The scam is getting someone to pay money for it, but it isn't actually worth anything at all.

What can you do with it? Show people that you can make poor financial decisions? Be greedy and vain and materialistic? Pathetic.

Doesn't this prove that humanity is worthless, since even in the earliest preserved burial sites archeologists and other excavators have found contained jewerly?