From the landing where you killed the nagas (to the right of the stairs as you enter this area), climb the handholds on the wall and pull up on the ledge.

Pick up the Health Portion and go behind the pillar. Jump to grab the beam and pull up.

Jump up to grab the handhold on the pillar and then jump to grab the narrow ledge running on the wall to the right.

Pull up to hug the wall and jump to grab the top of the pillar.

Pull up and turn around. Jump to grab the edge of the small room beyond. Pull up and approach the mechanism. Press the Interact button to retrieve the Gem (Shiva) #1.