From the publisher:
"Continuing the rules developed in Artifacts of the Ages: Swords and Staves, this book presents magic gems and jewelry that grow in power as wielders advance in level, allowing you to introduce artifact-caliber magic items to your campaign without giving the player characters too much power too early. Artifacts of the Ages: Rings provides gamemasters with rules for not just rings, but necklaces, bracelets, crowns, gems, and other such items of extraordinary power.

Artifacts of the Ages: Rings is the second in a series of innovative sourcebooks examining new ways to treat magic items in fantasy d20 System campaigns."