Ocean Pathways by Joan Marr

Ocean Pathways, the third book in the series, continues the story of the rings that resurface once again after centuries. Robbie Hetherington has been crippled since childhood, and he comes to have one of the rings seemingly by chance. With the aid of its magic and help from the old wise woman Sinead, Robbie finds a new and successful life for himself. Patricia OByrne, who having been orphaned in the great famine, is sent to Australia. Her one possession is the silver ring that she found in the dirt floor of an old house in Wicklow near her childhood home. She forges a new career, and when she voyages back to Ireland, meets Robbie, who owns a distribution business. The two make amazing discoveries about their past and the history and purpose of the rings. Patricia travels back across the ocean to settle in Tasmania, and the rings continue their journey through history.