The origin of the diamond's name, "ADAMAS", means "unyielding". Reika Ryuzaki is a "Jewel Master" with special abilities related to gems. Using her miraculous power to hear the voices of jewels and conquer human behavior through them, she is on a mission to find her father, who has gone missing due to a conspiracy by the dark organization Shani, at the request of the Diamond Syndicate!
