hippyengineer t1_iz1sals wrote
Reply to comment by locoghoul in Scientists have analyzed the specific labor costs for producing a 1 carat diamond in mines and through artificial synthesis. The work of human turned out to be more effective: 26 minutes versus 2-3.5 hours. by Skoltech_
They do now. Ones made in the lab are chemically pure carbon, with no impurities which impart cloudiness and lack of clarity.
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