The Stone Witch of Florence - Anna Rasche

Set in 1348 during the Black Plague in Italy, exiled healer Ginevra di Gasparo—who possesses the gift of harnessing gemstone powers—is summoned back to Florence by the same men who once condemned her as a witch. While she expects to treat the sick, she is instead tasked with using her jewels to track down a thief stealing priceless church relics. Success means official recognition as a physician, but Ginevra soon uncovers a deadly conspiracy that puts her in grave danger