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Diamond Color Grader

The CZ Master Set is the jewelry industry's first certified and registered color grader set. Each stone in the set has its own GIA Gem Colorimeter ID number. The unique grading display/container is made of color grading-approved white Acrylite that holds 10 stones (E through N). Provided with display ring stone holders for comparing mounted stones, and a convenient carrying case. Limited lifetime warranty against color changing.