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.
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.
What Our Students Say About Us
"The Diamond Specialist Course is excellent, as comprehensive as it could be, and its structure offers all the theoretical and practical knowledge for grading and evaluating diamonds."
"I very much liked the Diamond Specialist Course, it is excellent, as comprehensive as it could be, and its structure offers all the theoretical and practical knowledge for grading and evaluating diamonds. Moreover, IGS related articles complement and consolidate what you learned during the course. It is true that the previous graduation of the Professional Gemologist Course has made it easy for me to understand and learn the lessons from this course, which has really become a specialization in the field of diamonds. I would recommend anyone to take the Professional Gemologist Course first and then the Diamond Specialist course."
"I have been faceting gems as a hobby and just wanted to learn more about what I was really doing. I have gotten hooked now."
"I have been faceting gems as a hobby and just wanted to learn more about what I was really doing. I have gotten hooked now and really enjoyed your course. It is very well done . I'm going to see where this may lead me in the future now. Thank you all so much!"
"What started as a hobby is now a small home business for my wife and I."
"I have never known or heard of an organization that offers so much for its members, and at such a low cost. What started as a hobby in 1998 and now is a small home business for my wife and I has been made so much easier by the information you supply. Thank you."
Ernest and Peggy RoischRainbow Rocks, LTD
"IGS is a Godsend for me"
"I have been on the distant sidelines of the jewelry business for a long time with a great love of colored stones and working with gold. I must tell you that IGS is a Godsend for me, as I do not have the resources or the six months required to get a GG from the GIA now."
Charlie BernheiserIGS Member
"I love this hobby, but I'm not ready to pay to become a member yet. Anything I can do?"
Absolutely! We have a ton of free articles and guides to help you get your gem fix here on our site. In fact, we offer a free course on gemstone identification, which is perfect for hobbyists that want to dive a little deeper.