A quiz on each full course, and a short quiz on every lesson. Check your answers as you go.
- The four Cs · 16 questions, and 8 lesson quizzes
- Anatomy of a diamond · 12 questions, and 9 lesson quizzes
- Reading a grading report · 12 questions, and 9 lesson quizzes
- Diamond vs moissanite · 15 questions, and 10 lesson quizzes
- The history of the brilliant · 13 questions, and 8 lesson quizzes
About the courses: Courses.