Diamond vapor deposition

A similar topic came up a while back.

This may give some insight as to one process used.

The chamber shown may be a vacuum chamber...[?],
-unnecessary in space. ;-]

The animation begins with an exterior view, goes to the
molecular level.

-takes a while; ...-sorry.

animation depicting the{carbon vapor} deposition of diamond

http://www.mse.mtu.edu/~mjmaatma/index.html#top