[Jonty30]

It’s carbon, so I can’t imagine it being too costly to produce once it is mastered.

However, I do understand that what can be produced in the lab may not be producible commonly.

[Steely Tom]

However, I do understand that what can be produced in the lab may not be producible commonly.

It's only a matter of time.

It's taken about sixty years to scale lasers from continuous milliwatts to continuous megawatts.

But it only took forty years to scale semiconductor memory from a few hundred bits to gigabytes.

The technology for producing and storing antimatter exists today, at least for a few thousand particles at a time. Eventually, it will be scaled up. I hope it's done far out in space, but it may not be.

[jmcenanly]

Diamonds are also completely carbon. Here is a site that sells vapor-deposited diamonds. The process might be similar to what would be used to make the matrices described in the article.