Bootlickers for billionaires calls out millennial and gen z green hypocrisy for preferring synthetic diamonds because they are made with Chinese communist coal
I expect diamonds to fall off entirely in the next decade or so. Their (natural, later artificial) scarcity and (manufactured) tradition was all they ever had.
My wife's ring is moissanite, it was less than 1/10th the price of an equivalent carat diamond ring and you literally can't tell the difference. We both decided that we would rather spend that money on literally anything else. The mohs hardness is 9.5 for moissanite vs 10 for diamond which is practically the same, assuming you aren't using it as a beyblade vs a diamond ring.
Diamonds have a lot of practical value for jewelry because it's damn near impossible to damage them in everyday use, which can't be said for more brittle gemstones.
That said, synthetic diamonds will likely completely replace traditional ones except for people that want to reuse family heirlooms or something similar.