Do gold and diamonds really have any value?

Yes, I know a bit for electronic things but I think there is a really good chance that some African wondering around in the jungle would gladly trade the shining rock he found stuck between his toes for 2 cans of chicken soup and a can opener?
Update: Like in the movie ... 'The Gods Must be Crazy'.
Update 2: An African walks into a Chevy dealer and trades a cup full of 'shining rocks' for a new 2020 Corvette. See my point?
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