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Professionally color grade and detect fluorescence in diamonds in seconds. Best used if the lighting in the room is turned off or dimmed. Color Grading is best performed in the morning while your eyes are not fatigued. Gemoro has made professional color grading a diamond quick and efficient: 1. Place the your stone in the middle of the grooved grading tray at a 45 degree angle while laying the table of the stone against the front of the groove. 2. Turn on the natural daylight LED's while color grading or the UV lights when grading fluorescence. 3. Visually color match your stone to the CZ masterset stone. Keep in mind each of Gemoro's CZ Stone is laser inscribed with it's color grade. 4. Remember to store your CZ Master Set Pro in the case with the lid closed at normal room temperatures. Note: if you are sorting, use a 10x loupe to view the laser inscribe grades on each of the Gemoro CZ Masterset Stones. Gemoro's illuminated grading and storage case, featuries a built in grading tray, natural daylight and UV LED’s, powered by two rechargeable NiMH (AAA) batteries and a micro-USB power/charging system with indicator light, Green (fully Charged), Yellow(Charging) and Red (Low Batteries/Charge). Note that alkaline AAA batteries may be used. If using alkaline batteries, always replace the batteries after long periods of time to prevent premature corrosion or battery leakage. ***Hand-Graded in the USA***