Housekishou Richard-Shi No Nazo KanteiHousekishou Richard-shi no Nazo Kantei; The Case Files of Jeweler Richard; 宝石商リチャード氏の謎鑑定; 宝石商人理查德的谜鉴定; 宝石商人理查德的鉴定簿; 寶石商人理查德的謎鑑定; 寶石商人理查德的鑑定簿; 보석상 리처드 씨의 수수께끼 감정

The story follows Richard Ranashinha Dvorpian, a handsome British jewelry appraiser, and Seigi Nakata, a bright and upright Japanese college student. The duo solves various jewel-related cases by unraveling the hidden psychological aspects of their owners that lie within the gems.