Spell Gems that are shared have fewer Charges. It is also intentional that they’re rank 1 - this is done for balancing purposes.
But the text of the Obelisk trait is:
“Your creatures’ Ethereal Spell Gems have the same number of Charges that they’d have if they weren’t Ethereal.”
How does that work? If they still get fewer charges. I’d also like clarification on how the Obelisk trait interacts with Amethyst Attunement
“All creatures’ Ethereal Spell Gems are created with only 1 Charge.”