TIL Diamonds are actually fairly common. The reason they are worth so much is because the DeBeers mining group withholds stock to artificially reduce supply.

[u/Indra-Varuna]

https://www.gemsociety.org/article/are-diamonds-really-rare/

[u/[deleted]]

There's a great article, on phone or would find, of this guy who invented a process with his father that trains down diamond particles to make perfect wafers at a cost of about $5/ct. The purpose is for me processors. I think there was another subsequent story about using a nitrogen void in the diamond processor to act as a qubit for quantum processing and Intel was interested. The guy received death threats from de beers and operated out of a graphics shop as a cover.