Quote - > Quote - But saving as figure... hadn't thought of that. And so, when I load this multi-obj figure from my figure library, I just do a "Conform To..." and it sorts itself?

Nope. You'd have to rig with a skeleton to get that to happen. Ugh.

I was afraid of that.

I guess the other option is to just give instructions to users how to parent the multi-obj prop once they've loaded it.

BTW, Bill, that shader on the diamond is more or less yours - want to give you credit for it. One caveat: people who use this one which I am including as an option instead of the ones that work with "conventional lights and settings" (read: crap lights sans setting - nothing for the gem to reflect against) will need some sort of sky-dome (yours, preferentially) and lights that make sense and the problem with that is that people are going to load this freebie - yes, it's going to be a freebie for the May Rendo Newsletter - they are going to expect to use it with their favourite lights, which are all crap (sorry, light-makers, but this shader renders like poo in everything I've tried, and I've tried some of the most popular lights, because against sage advice I actually went out and BOUGHT lights) because there isn't anything to reflect against and usually lights are depth-mapped and no AO and ... and ... and.
So, freebie-downloader, beware. "Opportunity-to-learn-something" detected...

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks