In 2008, producing a CVD diamond cost $4,000 per carat. Today, that cost is estimated to be just $300 to $500. Meanwhile, the mined-diamond industry is in a bit of a downward spiral.

Element Six’s chemical-vapor-deposition (CVD) synthetic-diamond windows enable a range of optical applications such as high-power CO₂ lasers and extreme ultraviolet (EUV) lithography. CVD ...