Any takers? Lab Fad Diamonds may be forever. But their market value? That might prove less eternal. In a sign of the times spotted by Ars Technica, you can now buy a diamond-generating machine on the Chinese online marketplace Alibaba for the humble asking price of just $200,000. It’s as good an example as any that lab-grown hunks of pressurized carbon are easier to make than ever, as the mined-diamond industry continues to lose some of its shine — not to mention its market dominance. The machine, which originates in China — as most of these do — uses what’s known as the high pressure and high temperature process, or HPHT, which essentially mimics the extreme conditions that lead to natural diamond formation deep in the Earth. But to produce diamonds more efficiently, you’re gonna wanna shell out at least twice that amount for a chemical vapor deposition (CVD) machine. This gizmo works by placing a thin diamond “seed” into a vacuum chamber, in which carbon-rich gasses are heated into plasma, leaving pure carbon atoms …