Colored Stone Grading Lab

Through extensive hands-on practice using gemstones, you will explore grading the color, clarity and cut quality of a wide range of colored stones. Coursework includes the study of the GIA Colored Stone Grading System; how to describe color by hue, tone and saturation; and how to judge gem quality factors. Topics also include the relationship between light and color and developing color memory. Study of this content can improve the consistency and accuracy of colored stone grading skills. Students must pass a two-stone practical exam to complete the class successfully. Once you have completed the class, you will keep a class manual, a gem cloth, pinpoint incandescent light source and a color grading card.