The Kirin Tor rings are a number of rings, all of which share the ability to teleport the wearer to Dalaran. Acquiring one of these rings is the requirement for the achievement  Ring of the Kirin Tor (achievement).

These rings are all upgradeable: You buy the next better ring by tendering the current ring and a sum of gold. The amount of gold required depends on your reputation with the Kirin Tor faction, with the minimum cost being available at Exalted reputation.

						Gold
	iLevel	Strength physical	Agility physical	Mana caster	Crit caster	Max	Min
Initial	200	[Ring of the Kirin Tor]	[Band of the Kirin Tor]	[Loop of the Kirin Tor]	[Signet of the Kirin Tor]	8500	6800
Inscribed	213	[Inscribed Ring of the Kirin Tor]	[Inscribed Band of the Kirin Tor]	[Inscribed Loop of the Kirin Tor]	[Inscribed Signet of the Kirin Tor]	+1250	+1000
Etched	226	[Etched Ring of the Kirin Tor]	[Etched Band of the Kirin Tor]	[Etched Loop of the Kirin Tor]	[Etched Signet of the Kirin Tor]	+1250	+1000
Runed	251	[Runed Ring of the Kirin Tor]	[Runed Band of the Kirin Tor]	[Runed Loop of the Kirin Tor]	[Runed Signet of the Kirin Tor]	+1250	+1000

Thus, an Inscribed ring can cost a total of between 7800 and 9750 gold, an Etched between 8800 and 11,000, and so on.