Arinoa Flickergem's Exploding Crystals

You hurl a gem at a target location within 60 ft that you can see and realistically hit.  The gem shatters, releasing pure magical energy in a damaging shockwave.  Each creature in a Sphere of the size designated in the table below must make a Constitution saving throw or take force damage as shown on the table below, or half as much on a successful save.  Greedy bastards take additional psychic damage equal to half the force damage suffered.