From drop, go S, down ramp, go left. You come to a more or less circular area (maze), right hand rule till that rule drops you at a dead end (and 2 grated rooms). Turn 180 degrees and find a room with 2 grates and a non-grated exit to the S, and go S, and right hand rule, till you find a wooden door, behind it a room, another wooden door. Go right (to your left is a portal), and down the stairs till you hit the lava-hallways, in the pit is the NPC- object Smooth Rocks, double click, you get the Rock of Splendor.