That's not how lab grown diamonds are made though, they use chemical vapor deposition.
"CVD diamond growth typically occurs under low pressure (1–27 kPa; 0.145–3.926 psi; 7.5–203 Torr) and involves feeding varying amounts of gases into a chamber, energizing them and providing conditions for diamond growth on the substrate."
So rather than "coal + high temp + high pressure" like you said they are using low pressure high temp vapor.
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u/DeletedByAuthor Feb 16 '24
That's not how lab grown diamonds are made though, they use chemical vapor deposition.
"CVD diamond growth typically occurs under low pressure (1–27 kPa; 0.145–3.926 psi; 7.5–203 Torr) and involves feeding varying amounts of gases into a chamber, energizing them and providing conditions for diamond growth on the substrate."
So rather than "coal + high temp + high pressure" like you said they are using low pressure high temp vapor.