Is shattering just equivalent to a coma for gems?

In the first show -- Steven Universe -- it basically implies that shattering is equivalent to killing someone.

But in the future series, we see yellow diamond gathering cluster pieces from the prototypes and resembling them. After that's done and the pieces are all put back together, we see the gem reform complete and conscious.

So would that mean that shattering is just a coma unless the gem fragments are missing or the gem is irreversible to repair?