Since Conjure Gem is not tradeable. Would you mind giving us 100 charges per cast or get rid conjuring it all together and just give us a cooldown ability on the same cd? It is contributing to alot of button bloat.
They could at the very least let us replenish the charges on the go without it having to get to zero without an add-on.
This may or may not benefit you but my mage runs with one button for conjure and use:
#showtooltip Mana Gem
/use [button:1] Mana Gem
/cast [button:2] Conjure Mana GemRight-click to conjure, left-click or keybind to use and it updates the icon with the charges available.