I usually play with a decent amethyst a bit lower level than that. It really trivializes the game at those levels when you have good gems. My demon hunters were completely unkillable up through about halfway into Nightmare with radiant square amethysts in both hand crossbows, especially with any of their AoE abilities. I basically just stood in the fire and right-clicked until stuff died. It was about like having level 85 Triumph badge gear at level 60 in WoW.