Invest in yourself.
Accelerate your path towards a gemology career.
Enroll in our Professional Gemologist certification course and learn new skills.
Learn basic gemology. Understand gem properties. Use gemology tools. Identify gemstones.
Serving gemology students for over 15 years
Founded in 1998, The International Gem Society (IGS) was the first Internet-based school of gemology to serve a global audience. Our goal is to provide an 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 material created by Donald Clark to ensure continuity and rigor.
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.”
IGS Pro Member
“It does not matter how much you think you about gems, you never stop learning”
“You know the best thing that I have learnt from your great courses is that it does not matter how much you think you about gems, you never stop learning, each day there is something more learn, it will never stop. Thank all for the help, education and support that you give IGS members.”
One Very Proud Member
Certification Course Modules
All the information you need is located on our website in our Learning Center. There are no other books required. The gemology course is divided into sections and follows our Syllabus. We also have a list of recommended gemology tools.
An Introduction to Gemology
Our introductory module covers basic gemology concepts and terminology. It forms the foundation for the entire course.
The Advanced Gemology module introduces the more complex subjectssubjects, such as the optical and physical properties of gemstones.
Here we teach you how to use the tools of gemology and what to do with the information they supply. This is the essence of gem identification.
This section details the factors used in grading diamonds and colored stones.
Advanced Gem Information
Here we take your basic understanding of gems and dives deeper into the details on specific gems, such as corundum, spinel and garnet.
Once you have learned how gems differ from one another, how to identify them and what properties determine their value, you can begin to develop your appraisal skills.
Are you ready to invest in your passion for gemstones?
Make this the year you take the leap.
Some questions we often hear
Will I be assigned an instructor for the course?
The benefit of this approach is that each student can learn at his or her own pace, and on his or her own schedule. Students can take as long as they want to complete each exam in the certification process to ensure familiarity and understanding of the material.
Won’t the self-study model be difficult if I’m a beginner?
For beginners we recommend our structured Syllabus, however you may study in any order that suits you.
What is required to pass?
In order to pass the certification process the student must:
- Pass three 100-question written exams with a score of 87% or better. The student may retake the tests an unlimited number of times until they pass each one.
- Thereafter, they must also pass a practical exam which requires identifying and grading 15 gemstones. We will send you the gemstones, which will be common to the trade and include natural, enhanced, synthetic, and assembled stones. Deductions will be made for errors, and the applicant must score 87% or better to pass.
- When the written and practical tests have been completed with passing scores, the IGS-Certified Professional Gemologist certificate will be awarded.
How is the material administered?
All examinations are administered via online test-taking software accessed via your password-protected account on the IGS website.
Can I get a refund if I am not satisfied?
Please note that certification costs are non-refundable. A $50 refund is given if you choose to return the stones used for the practical test. (You may keep the stones instead, if you wish.)
How does the IGS course compare with those offered by the GIA or similar organizations?
The GIA is an excellent organization. Their Graduate Gemologist degree is the most respected credential a person can hold in this industry. If you have the time and money, and are serious about a career in the gem industry, the GG course should be your first choice.
The IGS certification program was created for everyone else. The founder of IGS and author of the program, Donald Clark, has strong connections with the lapidary community. For years, he listened to amateurs giving inaccurate advice to others. For example, he heard things like: “If your blue stone has an RI of 1.625, then it is topaz, not aquamarine.” Those two properties, color and RI, also belong to tourmaline and a few rare minerals. Blue topaz and blue tourmaline have vastly different values. Not knowing the difference can be costly, in terms of both money and reputation.
Donald Clark believed that the problem stemmed not from the well-meaning lapidary sharing his incomplete knowledge, but that there wasn’t anywhere to learn gem identification, short of taking a $3,000 course. For them, he created IGS. It is dedicated to all the gem cutters, collectors, jewelers, and others wanting to know more about gems. The Professional Gemologist program was also created for those lacking the resources for a GG degree. A typical example would be a person making a midlife career change. This often involves working two jobs for a period, or the time consuming process of starting a new business.
What the certification tells a customer, or potential employer, is that the holder has proven their knowledge of gemology: that they are versed in its terminology, the properties of gems, how they are valued, and that they possess the skills and knowledge to distinguish one gem from another. But let us be clear: having the IGS certification may open doors to a career in gemology. But, it is the way an individual presents themselves and his or her lab experience, and work ethic determines success.