Features: The diamond color comparison card tray can be used to identify the colors of diamonds and gemstones. Easy to use. The diamond colorimetric card can observe the color of the diamond itself under the lights of a colorimetric lamp. When grading diamonds, a dedicated colorimetric light is used, and a colorimetric board or paper is used as the background. The whiter the color, the rarer and more precious the diamond. The size is approximately 12.5x9cm/4.92x3.54inch. Foldable. Easy to carry. Tips: Color comparison cards are auxiliary tools for distinguishing diamond color levels, not a comparison tool for diamond color grading. Specifications: Material: Paper Size: Approx. 12.5x9cm/4.92x3.54inch Package Includes: 1x Diamond Grading Card note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.