Four aspects should be paid attention to when observing the color of emeralds: hue, brightness, saturation, and whether the color is uniform. 1. Hue Hue refers to the type of color, such as red, orange, yellow, green, blue, blue and purple. Different emeralds, some are green, some are green with bluish, and some are green. Four aspects should be paid attention to when observing the color of emeralds: hue, brightness, saturation, and color uniformity. 1, Hue Hue refers to the type of color, such as red, orange, yellow, green, blue and purple. Different emeralds, some are green, some are green with blue, and some are green with yellow. 2, lightness lightness refers to the brightness of the color, light, dark, etc., the higher the lightness, the brighter the color. 3. Saturation Saturation refers to the vividness of the color, also known as the purity of the color. 4, GUILD emerald color grading system The basic way of naming color levels is: color level u003d intensity + hue, intensity is the comprehensive effect of lightness and saturation, as shown in the figure below. Vivid in the upper right corner is the highest color intensity, translated into Chinese as'yan'. If you follow the above formula and add the hue Green to form Vivid Green, it is the first-class color among emeralds. The above is the author's summary of the emerald color grade comparison chart information for you. The information comes from the Internet. If there is anything wrong, please understand. If you need jewelry processing, inlay, and customization, please visit the official website of jewelry inlay. Jewelry inlay will be dedicated to You serve!