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making this particular gem fall in the "good" category.

and the second number in sequence is the Saturation of color in the gem.

So, as an example, when you see a Ruby given the color "R", this would indicate the color is "Red" meaning the primary color is Red and there appears to be no noticeable secondary color...

if the tone/saturation numbers were listed as "6/5"...

this would indicate the gem has "Medium-dark" tone and "Strong" saturation of color...

The 3 charts below are based on the GIA (Gemological Institute of America) "Color Stone Grading System", where the Color with it's various Hues, the Tone, and the Saturation of color in a particular gem is listed.

You will normally see this system identified by a letter or set of letters, followed by two numbers.

The letters are abbreviations of the Color and Hues visible...

the first number is the Tone or lightness/darkness of a particular gemstone...

The following examples will help you understand the process involved in how a gems color is determined. This example tone chart starts with #2 very light, and goes to #8 very dark, as the tone examples. Look at the illustration to the left to see which hue compares best to the examples on the hue wheel.

The sample stone is green, with a touch of blue, so the gem is very slightly bluish green.

The hue shows up as bright flashes of brilliance when you look at the stone in the face-up position.

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