Gem-A Courses & Colored Stone Associate®: Frequently Asked Questions

Who is Gem-A?

The Gemmological Association of Great Britain, or Gem-A, is the world’s longest-running gemological education organization based in London, England. The non-profit organization is committed to promoting the study of gemology through the provision of education, equipment, and membership to an international community of gem professionals and enthusiasts. Gem-A seeks to serve the best interests of the gem and jewelry industry worldwide through its commitment to supporting best practices in gemological research, education and trade standards.

The roots of Gem-A can be traced back as early as 1908, when a gem training course was proposed for the jewelry industry by the gemological committee known as the National Association of Goldsmiths (N.A.G.). This course would later become the Gem-A’s Gemmology Diploma, which is now Gem-A’s flagship course, alongside the Diamond Diploma and various workshops and events.

This committee matured into the Gemmological Association of Great Britain, a Branch of N.A.G., and eventually became a wholly independent organization. Now Gem-A is a registered UK charity and its gemology and diamond courses are taught in 25 countries worldwide. Gem-A’s prestigious diplomas in Gemmlogy and Diamonds are now globally recognized as qualifications of the highest status.

What Does the Course Entail?

The online Gem-A course has been designed to provide you with basic gemstone information you may need in your professional career or in your quest to learn more about gems and gemology if you simply love gemstones. The GemBasics course, which retails for $499.99, is a series of 12 video lessons, some with sub sections. It includes all the gemological tools, gemstones and specimens that you will need to successfully complete the course. For more details and information about the course, please visit

What Do I Receive When I’ve Finished the Course?

Upon successful completion of the course, you will receive a certificate of achievement indicating you have obtained the Colored Stone Associate® credential.  Achieving this milestone also gives you the opportunity to use the letters Gem-A C.S.A. as part of your professional and credentialed signature.

Who Should Take This Course?

The GemBasics course is designed for collectors, hobbyists and anyone who is passionate about gemstones. Or perhaps you want to take a refresher course for your current career position or have just chosen the gemstone and jewelry industry as your desired career path. Regardless of the reason, Gem-A’s online course is for you. In simple, easy-to-understand language and practical applications, we believe you will consider the knowledge you gain from this course invaluable in your future endeavors. Whether you’re a novice or budding gemologist, there’s something for everyone to learn with this course.

Why Do People Study With Gem-A?

  • First and foremost, Gem-A is the longest-established provider of gem education in the world for over 100 years.
  • Gem-A offers advanced gemological courses, including a Foundation Certificate and a Gemmology Diploma.
  • Gem-A’s Gemmology Diploma, comparable to other internationally recognized gemological diploma courses, is designed to enhance your gemological skills and give you the essential skills needed to handle, test and identify a wide variety of gemstones.
  • All Gem-A courses cover a wide base of knowledge and prepare you for a career progression in the gem and jewelry industry.

How Do I Enroll?

To register, call (865) 692-6000 ext 3610 from 8am EST to 5pm EST Monday through Friday.

How Does the Course Work?

Since this is an online program, you will receive the necessary gemstones, specimens, tools and videos to complete the 12 lessons in your course. Dr. Jack Ogden, former Gem-A CEO and renowned expert in Gem-A’s International Development, Media and Communications, will lead you through each chapter with his expert knowledge of the jewelry and gemstone industry.

Once your course order is processed, you will receive a package containing your gemstones, specimens, tools and course notes. You will also receive a welcoming email from Gem-A that includes your unique online course log-in. This course allows you to work at your own pace. When you finish it successfully, you will receive a statement of achievement from Gem-A recognizing you as a Colored Stone Associate®.

Who Do I Contact if I Have Questions About the Course?

If you have questions or concerns about your course work, online support is available at Gem-A. If you have any other questions about registration, please call (865) 692-6000 ext 3610 from 8am EST to 5pm EST Monday through Friday.

How Long Do I Have to Complete the Course?

Gem-A allows you 12 months to complete the GemBasics course.

Are There More Courses I Can Take?

If you choose to continue your gemological education with Gem-A, you can contact them by accessing their website at