Gem Cutting panel can not be opened via GUI or Hotkey (PC)

Summary:
The gem cutting panel in the game cannot be accessed via the user interface or via a key combination. The only way to open it is to add a new gem.

Steps to reproduce:
- Try opening the gem cutting control panel directly from the game interface. There is no keyboard shortcut and no option in the character menu.
- Add a new gem from the inventory to a slot.
- The gem cutting panel will become accessible.

Expected :
The gem-cutting panel should be accessible directly from the UI without having to add a new gem.

Agree this is super frustrating, very clumsy and an inexplicable omission.