Usually a gemstone would be socketed into a purpose-made item to give the item various effects, such as flame, sharpness or even sense, but these were themselves the item and the gem. The power and the conduit.

Only the mage hunters had access to such exquisite and expensive gems.

Precious as they were, these arc stones were also fragile because of it, and had to rest inside a regenerative compartment built into the mage hunter suit.