Diamonds are the biggest scam ever invented, only carbon atoms in a fancy order, all propped up at the time to distract people from the real wealth that was gold. Very efficient until, unlike precious metals and bitcoin, an unlimited quantity can be supplied in a lab

Diamonds were never a rare commodity. They have vaults full of them. They has just created a demand for them by keeping the supply so low.

with resources one can purpose design and build diamonds or diamond-like carbon materials for whatever you like. Even on a nanoscale.

DeBeers has lobbied and marketed very well, but it will not last once people know more. They better get to marketing "natural" diamonds!