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Professional Certifications

Intermediate - Advanced 7 Units 50 Lessons
Diamond Specialist Certification Course

Learn the fundamentals of diamonds — from optical and physical properties to grading and ethical and legal issues. Learn to distinguish natural diamonds from synthetics and diamond simulants. Keep the kit, which includes one natural, jewelry-grade diamond. If you successfully pass the quiz and gem identification test, then you will be an IGS-certified Diamond Specialist.

Intermediate 6 Units 95 Lessons
Professional Gemologist Certification Course

The International Gem Society (IGS) was one of the first online schools of gemology to serve a global audience. Our goal is to provide a flexible and affordable education in gemology. IGS's founder, Donald Clark, CSM IMG, created a robust testing process to ensure that those with IGS certification would stand out in the crowd. IGS continues to use the testing process created by Donald Clark to ensure continuity and rigor.

About IGS Courses

From Actinolite to Zoisite, dig into every facet of the fascinating world of gems with IGS gemology courses!


Pick and choose from what subjects interest you.


Courses are guided lesson-by-lesson including progress tracking.


Test your knowledge with written exams and real gem ID exams.


Earn a certificate to help get a leg up in your career.

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