Official GIA

GIA Is the Largest, Most Respected Nonprofit Source of Gemological Knowledge in the World GIA exists to connect people to the understanding of gems. As a long-standing scientific authority, GIA is not only a unique source for diamond knowledge, its grading reports inspire confidence wherever they appear. GIA's commitment to protecting diamond buyers inspired the Institute to create the 4Cs and the International Diamond Grading System™. These methods are the universal benchmarks by which all diamonds are judged. As the birthplace of these standards, and with its investment in continued gemological research, GIA's authority is unequaled. The world's most respected retailers, museums, auction houses and private collectors rely on the expertise of GIA graders to assess, grade and verify their gems. They recognize the importance of complete, unbiased, scientific information in gem assessment, and absolutely trust GIA to provide it. To learn more, visit: http://www.gia.edu