I can't help but worry that the technology wouldn't be enough to solve the way social problem of existing stakeholders not wanting to lose the value of their investments. I'm not sure exactly how comparable it is from a utility perspective, but diamond seems like there would at least some incentive to have available cheaply given how durable it is, but my understanding is that its scarcity is almost entirely artificial, and for non-utility purposes, it seems unfortunately very common for people to prefer "real" diamond, which fuels the inflated pricing.

That's not to say I think this shouldn't be pursued, but I feel like the science and technology side might end up being the easier half of cheap gold from this becoming a reality. I sadly have more faith in humanity's ability to figure out solutions to incredibly difficult technical problems in the long run than I do in our ability to solve the social problems that would benefit almost everyone but require changing the status quo.

(As an aside, I personally find the idea of lab-grown diamonds pretty cool just from a science perspective, and the fact that they're cheaper and don't have the same ethical concerns to make it unfathomable that I'd ever want to purchase a mined one, and I'm lucky that my wife felt the same way when we picked out her engagement ring, although she ended up selecting a lab-grown pink sapphire instead).