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Remember when NFTs sold for millions of dollars? 95% of the digital collectibles are now probably worthless.
(markets.businessinsider.com)
This is a most excellent place for technology news and articles.
Yellow, shiny, and untarnishable/non-poisonous. The latter are very nice properties to have for jewelry, as your skin will eat away most metals over time.
People like looking pretty, that has consistent value other than using it as a medium of exchange/ store of value.