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TONE VALUES
The first number in the color gem grading code represents the tone of the gem. The value can range from 0, colorless or white, to 10, black. This number reflects the relative brightness or darkness of the gem when viewed through the table. This is the large, horizontal facet at the top of the gem that acts like a window into it.
SATURATION VALUES
The second number in the color gem grading code stands for the saturation, or intensity, of the gem's hue. This value can range from 1 to 6. However, unlike tone, the meaning of this value differs somewhat depending on the hues. Warm hues, such as red, orange, and yellow, become shades of brown as their saturation decreases. Cool hues, like blue and violet, become progressively more gray as their saturation decreases.
CLARITY VALUES
Some gem species frequently contain many noticeable inclusions. Other typically have few inclusions. This varies due to the many ways gemstones form underground. We have divided colored gemstones into three categories or types: I, II, and III.
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