Sure, but those aren't gem-grade. They're usually black and opaque (polycrystalline) or yellow. And in any case they're very small. When I say new industrial

Sure, but those aren't gem-grade. They're usually black and opaque (polycrystalline) or yellow. And in any case they're very small. When I say new industrial uses, I'm thinking of things that haven't been done before and hinge on large bulk volumes of material: Windows, very large diamond anvil cells, high-performance heatsinks, and stuff like that. Lots of cool things are going to be developed.