Love this question.
Lab-grown diamonds are popular because they take a fraction of the cost to make than attempting to mine diamond. As another commenter pointed out, we CAN make natural gas at scale and cheaply – but oil is a little different.
We definitely can produce octane (or other oils/fuels) in a lab environment, but it takes a lot of energy and a lot of raw materials – meaning that it isn’t economically feasible to do so right now for a substance that we know pollutes the earth.
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