This gnarled hand allows you to gain the benefit of a third ring.
Wondrous Item 1,625,000 gp
The mummified hand has one ring item slot that you can use in addition to your own ring item slots. As long as you hold the mummified hand, you gain the benefit and can use the powers of any ring placed on one of its fingers. If two or more rings are placed on the mummified hand, none of the rings function. You cannot benefit from more than one mummified hand.
Published in Adventurer's Vault, page(s) 175.