Basically in the server im in (ATM-9) the royal family gem has been bugged so that it is only a Item.Apotheosis.Gem item with no stats, this is persistent across all version of atm-9 and all versions of apotheosis that atm-9 uses. Similarly, resetting the world file, reinstalling the mod and modpack, and using a default apotheosis config has not been effective in fixing this issue. The only thing I can think of is that the server runs on mohist if there's any known mod or plugin incompatibilities between apoth and that.

That would imply the gem failed to load, hence a gem with that NBT being invalid. You can check your game log for loading errors, but there isn't any more specific support I'm able to offer.