Most diamonds have a low nitrogen content, which gives them a hue of yellow, or hydrogen, that rather gives a gray hue. The best way to discern the color of a diamond is by comparing it to another diamond. To do so, the ideal conditions are a room lit by natural light, but you can also use a lamp that produces a neutral light.
Color and numbers
The perfectly transparent stones are rare. A stone of color D / purity IF is considered having perfect color and purity.
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Color F - value reduced by about 40%
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Color H - value reduced by about 60%
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Color K - value reduced by about 75%
IF stones are particularly rare, the discount will not be as strong for stones with some inclusions.
A colored stone D / purity Vs2
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Color F - value reduced by about 20%
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Color H - value reduced by about 35%
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Color K - value reduced by about 50%
A stone of color D / purity Si2
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Color F - value reduced by about 7%
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Color H - value reduced by about 20%
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Color K - value reduced by about 40%
A colored stone D / purity i1
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Color F - value reduced by about 6%
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Color H - value reduced by about 10%
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Color K - value reduced by about 35%
Source Rapport List
