Get to know all you need about diamond – the history, facts, quality factors, treatments, imitations and much more here at GIA.

Since then, diamond knowledge has grown steadily, with research by chemists, physicists, geologists, mineralogists, and oceanographers. In the past 50 years alone, scientists have …

Diamond forms under high temperature and pressure conditions that exist only within a specific depth range (about 100 miles) beneath the earth’s surface. Diamond’s crystal structure is …

Diamond stands at the apex of the hardness scale with a value of 10. It also has the highest thermal conductivity and the highest molar density of any terrestrial material, as well as a high …

The 4Cs describe the individual qualities of a diamond, and the value of an individual diamond is based on these qualities. The terms that people use to discuss the 4Cs have become part of …

The Robert Mouawad Campus at GIA World Headquarters is the premier gem studies school — fully integrating state-of-the-art classrooms, the famous GIA laboratory, and an internationally …

Examines the challenges of ethical sourcing and production of colored stones, and what some industry leaders are doing to address the situation.

With a GIA Diamond Grading Report, you can confidently make your next diamond purchase. With an unbiased diamond evaluation, you’re free to focus on its beauty.

GIA’s 4Cs transformed the way diamond quality is determined and communicated, forever changing how diamonds are evaluated, bought and sold. The 4Cs are for everyone.

While choosing a diamond is a very personal decision, evaluating a diamond should always be a matter of precision. At GIA, we are incredibly proud that our 4Cs of diamond quality continue …