Sapphire Blue

Gwendolyn is the Ruby: she possesses the innate power to travel through time. Accompanied by Gideon, the Diamond, with whom she is deeply in love, she is tasked with journeying across the ages in search of ten other time travelers. But trouble is only beginning for Gwen, as her attempt to unravel the mysteries of the Circle, which is hiding something about a mysterious prophecy, leads her to uncover far more terrifying secrets about her own family…