This CZ Color Master Set PRO 3 has some scratches and nicks from being taken to a show for demonstration purposes.  Of course, it still allows you to professionally color grade diamonds in seconds. This upgraded set features the largest range of diamond colors available (D-N). All 11 stones are treated with GemOro’s proprietary COLORLAST technology to ensure permanent color saturation. The precision CZ Master Set Pro 3 is expertly hand-graded to master diamond color standards using the GIA grading scale. The set comes in GemOro’s patented LED illuminated grading and storage case, featuring daylight and UV LEDs, powered by rechargeable NiMH batteries and a micro-USB charging/power system.