Jewels of Time — Tess Mallory

MYSTERIES OF TIME, SECRETS OF THE HEART
It was just a necklace, a gift from her grandfather. How could Victoria Hamilton believe that the heirloom would help her travel through time --- until she found herself in the sights of the most desirable Rebel soldier she could ever have imagined?
But even though Lt. Jake Cameron saved Torri from death on a Civil War battlefield, the clever beauty couldn't convince him that she wasn't a spy sent to stop his mission. In the face of cruel reality, Torri and Jake dared not trust each other. Yet in the tender mercies of their hearts, they had no choice but to surrender to the overwhelming power of love.