Everlasting By Angie Frazier

Sailing aboard her father's ship is all seventeen-year-old Camille Rowen has ever wanted. But as a lady in 1855 San Francisco, her future is set: marry a man she doesn't love in order to preseve her social standing. On her last voyage before the wedding, Camille learns the mother she has always believed dead is in fact alive and in Australia. When their Sydney-bound ship goes down in a gale, and her father dies, Camille sets out to find her mother and a map in her possession - a map believed to lead to a stone that once belonged to a legendary civilization...