I liked Gemsigns, but thought it was a bit overwrought, and a bit muddy.... I really liked Binary because it focused more on the story, the science, and the implications of living in a world with gems. -0.5 stars for glacial pacing/Phoenix chapters, -0.5 stars for incredibly weird affection shown at odd times between characters (Sharon/Mik, Rhys/Callan). Also I wish the foreshadowing in both books didn't make it so you can spot the twist a mile away, the reveal should actually reveal something.