Hou Kaingan pearl is a typical precious stone from a Hou Kaingan oyster, comprising a three-inch glossy black sphere. On the terrestrial market (also saturated with cultural gems) such a sample would fetch at least several thousand dollars. However, the potential energy stored in these beads is by no means insignificant. The problem is getting it out safely. (RPG: "First Steps: The Stargate Unexplored Worlds Roleplaying Sourcebook")