I'd like to keep Tourmaline as the name for that dragon, since Shade chose it, and it's sort of a gem dragon. Apparently there is also a different rainbow dragon, so I'd stay away from that. However, I don't mind listing quartz or spectral as other nicknames if you want to add that to the entry.
Yes, there is already a Rainbow Dragon in the CC that's a conversion of an evil spellcasting dragon from Dragon #146.
We've just got too many dragons!
I would be happy to add some additional names to the Tourmaline entry though, something like:
Tourmaline dragons are known by many other names by different cultures, the commonest alternative name for these dragons are prismatic dragon, spectral dragon, quartz dragon, and rainbow dragon.
The question is how to go about it (see below).
Let's deal with the Faerunian yellow next.
Before we go too far, both the Tourmaline and Faerunian Yellow Dragon have completed CC entries, so am I going to update the Temp Creature Catalog HTML files for these dragons and send them to Darjr once we've agreed on the changes?
Alternatively, am I just posting a "how we'll update it" note on for these dragons on Corrections to Monsters in the CC?