The Hofer Letters are important documents that travel with the diamond. They provide a thorough explanation of the colour presented in a simple format that enables any collector, investor or dealer to locate the information that interests them most. The Letters provide the basic data necessary to identify the diamond, including the weight, measurements, shape and style of cut. They also provide additional detailed information about the three basic elements of colour: hue, lightness, and saturation. Plus, many other topics such as: beauty, rarity, history, common colour names; how the shape outline, proportions, and facet pattern affect the perceived face-up colour, and in some instances a brief discussion of the colour origin.
