ColorCodex™ color referencing system is an easy to use, intuitive system for comparing and referencing the color of faceted gemstones. It was developed by gemologists as a tool to allow the industry to establish the color of a gemstone in a manner that is both accurate and repeatable. Color is a complex world of hue, saturation and tone. All of these factors combine to create the particular color that we see, with a seemingly limitless variety of shades and nuances. Gemstones add an intricate dimension, as they are transparent bodies which through faceting present a mosaic of brightly colored or more subdued reflections, as well as blackened areas of extinction. All of these areas then fluctuate and shift as the gemstone is tipped and rotated. The system includes a total of 65 different hues of color represented on 13 ColorCodex™ sheets. Each hue is represented by its own column which is then divided into 8 windows that depict the varying intensity or saturation of that specific color. The colors, or hues, are evenly numbered horizontally across the page from 10 through 138. The vertical windows showing intensity are given odd numbers from 03 through 17. Combining these two numeric values (e.g. 22 - 07) defines not only a specific color (column 22), but also its level of saturation (level 07).