The International Gem Society (IGS) is an online resource and learning community for people interested in gemstones, from professional gemologists and jewelers to hobbyists and lapidaries. It provides trusted information and educational services designed to support gemstone identification, informed buying, and further study.

Its Learning Center offers more than 1,800 articles and videos covering gemology, mineralogy, jewelry, lapidary work, gemstone treatments, grading, and valuation. The site also features an A-to-Z gemstone encyclopedia, a searchable photo gallery, birthstone information, diamond-buying advice, expert buying guides, and price guidance for more than 70 gemstone types.

IGS offers on-demand mini-courses and certifications in professional gemology, diamond specialization, and mineralogy, as well as an online course for younger learners. Members can connect with gem experts and peers through the community forum, access additional learning resources, and use the Gem Price Guide. The site also includes a directory of gem-related businesses, such as appraisers, auctions, cutting services, laboratories, and suppliers. IGS serves both personal interests and professional development in the gem and jewelry field.