Copy of GIA: "COLORED DIAMONDS: COLOR REFERENCE CHART".

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Date of Publishing: 2023.
No. of Pages: 16.

For colored diamonds, the aspect of color far outweighs the other “C’s” (clarity, cut, and carat weight) in the determination of value. Therefore, it is critical to understand the relationship of color appearances that affect color grades and descriptions. For most people, color is an intuitive response rather than a true knowledge of the systematic ordering of color appearances. Both, however, are crucial when the romance of color also becomes the business of color. GIA has developed this booklet of color reference charts to help the diamantaire, retailer, and consumer understand the ways in which diamond color appearances transition and relate. Color is described using three attributes: hue (the appearance of red, blue, green, or anything in between), tone (the relative lightness or darkness of a color), and saturation (the relative strength or weakness of a color). The color appearance of a gem is the result of a combination of these three attributes. By standardizing the organization of these three attributes, a color’s appearance can be located in color space. The manner in which GIA organizes color is reflected in the tone/saturation charts in this booklet. Understanding this organization will help the reader grasp the relationship of GIA’s color grades and descriptions.

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Contents:

1. Introduction.

2. Hue Circles.

2.1. Continuous.

2.2. Lighter Tone.

2.3. Darker Tone.

3. Diamond Color Reference Charts.

3.1. Yellow (Cooler). 

3.2. Yellow (Warmer).

3.3. Orange-Yellow.

3.4. Yellow-Orange.

3.5. Orangy Pink.

3.6. Pink.

3.7. Purplish Pink.

3.8. Blue.

3.9. Yellow-Green.

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