"
Sardior was the dragon god of night, psionics, and secrets, and he was also the Master of gem dragons."
Citation:
The Legend of Sardior.
If we consider "somebody's home game" to be the correct description of the official Forgotten Realms canon, sure. Note that that "published on the official site" thing is simply reprinting and translating to 3.x statistics something that was written in 1980 (Dragon Magazine #37.)
You can find the actual magazine online and see the text yourself. It calls him the "Master of gem dragons," of course, but it also speaks of him moving his domain about through the planes. That's something only gods do, AIUI.
Edit: Ed Greenwood explicitly says
Sardior is worshiped as a god in FR. So that would mean, officially, he is one in both 3e and 5e.
Separately from the above, can someone explain like...what exactly it is that makes gem dragons cool/interesting?
Because I've never really understood it apart from "they're psionic." No intent to yuck anyone's yum (I get enough of that as a metallic fan, not gonna do it to anyone else!), I just generally don't
feel anything about gem dragons and thus wonder if I'm missing something.
Also...what's the deal with topaz dragons having backwards wings? Like...just....
why?