JCK Competitors

At GIA, we believe every gem has a story — formed deep within the earth and revealed through science. For nearly 100 years, we’ve been bringing those stories to light through research, discovery and education. As a nonprofit, our mission is to ensure confidence in gems and jewelry by blending innovation, knowledge and science. From creating the 4Cs of diamond quality to inventing tools used worldwide, we make learning an adventure and turn discovery into truth. We don’t buy, sell or appraise gems. Instead, we provide trusted reports, education, and insights that help people — from industry professionals to everyday consumers — make informed decisions with clarity. This is GIA: where curiosity fuels innovation, knowledge builds confidence and science inspires a world of trust.

W magazine

The Rapaport Group is an international network of companies providing first class, added value services that support the development of free, fair, efficient and competitive diamond and jewelry markets. Established in 1976, the Group has over ten thousand clients in 70 countries. Group activities include publishing, electronic information services and trading networks, diamond grading and certification, global trading and auction services, consolidated international shipping, international sourcing, quality-control and compliance services, financial, research and marketing services. A primary and unifying focus of the Group are knowledge based information services that create transparent and efficient markets. Examples are the Rapaport Price List and Rapaport Magazine, the RapNet® – Diamond Trading Network, diamond grading and certifications services and the Rapaport Fair Trade Jewelry initiative.