DIAMOND AND COLORED GEMSTONE EDUCATION
The 4- C’s: Color, Cut, Clarity, and Carat
GIA CERTIFIED GEMSTONES
While renowned for its diamond grading expertise, GIA also receives a vast array of colored gemstones for identification. Over the decades, the Institute has created a database of information on more than 100,000 individual colored gemstones. Using this database and sophisticated analytical tools, GIA can pinpoint a gem’s identity and, depending on the gemstone, its geographic origin. GIA also identifies synthetics, simulants and stones that have undergone treatment. A particularly important activity is determining whether a gemstone’s color is natural or the result of a treatment process.
GIA’s processes for evaluating colored stones involve the same item identification and tracking procedures used in diamond grading.