Tao asked an important question and I realized that I need to clarify the enviroment a bit more.
1. There is a huge emerald that sits in the room, atop a stone alter.
2. There is a long cloth under the emerald, covering the stone alter.
3. The emerald sits a few feet from a portal that is shimmering with life. The portal has a pillar on both side of it, covered in odd writings and the pillars glow in the same color as the emerald.