Abstract: To enhance the course quality and cultivate qualified jewelry talents, we take the initiative to practice student-centered teaching for the "Diamond Grading" course. We build up a pluralistic teaching mode by employing blended online and offline teaching through smart teaching tools such as "Rain Classroom". It can greatly improve students' learning efficiency and enhance the communication between teacher and students, and among students themselves; In order to meet the current teaching needs, we add the content of fancy-colour diamond grading in the new course book integrating paper textbooks, electronic textbooks and classroom instruction; Taking students' learning experience and learning gain as educational objectives, we change the course evaluation mode from one examination to continuous assessment throughout the whole teaching process and the final score is composed of classroom performance, laboratory reports, investigation reports and course thesis. In this way, we aim to transform our teaching mode from teacher-centered to student-centered mode and cultivate students' self-learning capability and comprehensive ability.