Housekishou Richard-shi no Nazo Kantei

The 'heartwarming jewel mystery' series centers on the handsome jewelry appraiser Richard Ranashinha de Vulpian and the bright and cheerful college student Seigi Nakata as they uncover the hidden messages that lie within jewels while they solve various jewel-related cases by unravelling the hidden psychological aspects of their owners that lie within the gems.
(Source: Anime News Network, Edited)