The Secret of the Jewels — Janet Lane Walters

The Black Jewel has been destroyed and the White Jewel rules the others. The Brotherhood of Mages are in flight and many of the mages are dead. Something troubles the Jewel Holders. The words of an elderly Healer send them on quests to find the secret of the Jewels they hold. Are the Jewels merely tools or is there a hidden danger in their use? The seven Holders must learn the truth.