A&A's Color Grading Cabinet is designed to give you both natural, fully-diffused daylight illumination for accurate color grading of diamonds and other gemstones, as well as UV light that for checking diamond fluorescence. The translucent bottom tray is grooved to hold stones at the correct angle for grading and comparison without reflections or glare. A special rocking tray in the top section lets you view stones with illumination from below through an opening designed for that purpose.