(GS, GS 3, GSIII, GS III) abbv. GemStone III. The game this glossary is supposed to help clarify. GemStone III is an Internet text-based multiplayer roleplaying game which is set a realm called Elanthia, which is a fantasy world loosely based on midieval European setting. There is no set "goal" in the game, and the best way to think of it might be as that of a living novel--one with hundreds authors. Though there is a large "hack and slash" element of the game that compels many players, the "roleplaying" is heavily encouraged by game staff. The game is not free to play (price ranges from $9.95 to $39.95 per month depending on what sort of perks and benefits you want or are willing to give up) but a free trial is probably available at Simutronics' Official GemStone III Web Site.