Learn the fundamentals of diamonds - from optical and physical properties to grading to ethical and legal issues. Learn to identify 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
"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 Roisch Rainbow Rocks, LTD
"What a gift you give, passing this knowledge to those of us who are seekers"
"Just wanted to thank you for the fantastic adventure I have had since becoming a member of IGS. The quality of your Gemology Course is tops. Nice to know that such folks as you exist. What a gift you give, passing this knowledge along to those of us who are seekers."Dr. John Parrott IGS Pro Member
"It's like a good who-done-it mystery. It just can't be "put down."
"You are one heck-of-a-writer. This course is so well written, that I'm convinced that anyone, even me, can understand and master this material. After having read the first four introductory articles, I find myself actually wanting more time to study. It's like a good who-done-it mystery. It just can't be "put down."Joe Tulving IGS Pro Member
"It doesn't matter how much you think you about gems, you never stop learning"
"You know the best thing that I've learned from your great course is that it doesn't matter how much you think you about gems, you never stop learning. Each day there is something more to learn, and it will never stop. Thank you for all the help, education and support that you give IGS members."Peter Checkley IGS Pro Member
New courses are on the horizon!
Keep up with our latest news and get notified when they launch: