The Fire Opal Mechanism (Jewel, 2) [Wilde, Fran]

"Jewels and their lapidaries and have all but passed into myth. Jorit, broke and branded a thief, just wants to escape the Far Reaches for something better. Ania, a rumpled librarian, is trying to protect her books from the Pressmen, who value knowledge but none of the humanity that generates it. When they stumble upon a mysterious clock powered by an ancient jewel, they may discover secrets in the past that will change the future forever"--