The Gemmological Association of Great Britain, or Gem-A, is the world’s longest established provider of gem and jewellery education. Our Gemmology Diploma evolved from the first gem course proposed for the UK jewellery trade in 1908, and our prestigious Gemmology and Diamonds Diplomas — taught in seven different languages and 26 countries around the world — are recognised throughout the world.

You will learn about coloured gems and diamonds, their identification, value factors, and the many challenges of treatments and imitations — crucial knowledge for buyers, sellers and valuers of gems, as well as gem collectors who, attracted by the extraordinary beauty of gemstones, simply wish to pursue a new hobby.

Continue your professional development by becoming a member of Gem-A. We offer individual and corporate membership, which will keep you up to date with the latest developments in gemmology. Membership also gives you the chance to connect with Gem-A’s global community of gem enthusiasts, graduates and professionals.

Renew Your Membership for 2023

Gem Hub is an educational resource for aspiring and professional gemmologists. Here, you will find a range of articles dedicated to enhancing your gemmological knowledge as well as informative features that delve deeper into specific topics. Gem Hub spotlights the latest Gem-A news from around the world and includes extracts from past issues of our membership magazines, The Journal of Gemmology and Gems&Jewellery.

Gem-A have been providing education for over 110 years and Gem-A Instruments have supported Gem-A students and Members with essential equipment for over 50 years. If you are a current Gem-A Member, you will already have been assigned log in details, for access to your discounted rates from Gem-A Instruments.