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Diamond shapes
Color
A diamond is deemed colorless for its capacity to absorb all light rays
equally. These are identified as in the D to F range, and they have no
detectable color, allowing the maximum amount of light to shine through
the diamond. They are the most expensive.
Diamonds in the G to I range may appear to be colorless to the naked eye,
but they exhibit a minuscule amount of yellow and are called Near
Colorless. These may be more affordable and may appear to be just as
brilliant as a colorless diamond.
J to M stones will exhibit Faint Yellow traces.
Diamonds rated from N to Z in the color scale will show deeper yellowing,
and even tinges of brown and gray.
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GIA
Diamond Color Scale :
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Fluorescence
That bluish sheen which can be observed in a diamond under ultra-violet
lighting, is known as fluorescence: a quality that subtly conveys on a
diamond its mysterious allure.
It is not well known that medium to strong blue fluorescence in a quality
diamond will actually improve its brilliance and loveliness.
Yet
uninformed buyers are typically troubled by the mere mention of
fluorescence in a stone.
The fact is that fewer than 10% of gem quality diamonds will exhibit this
blue fluorescence either in an incandescent lighting situation or even
when viewed in sunlight, which has strong ultraviolet properties.
There is no need to fret over fluorescence. In D - H color stones,
fluorescence only rarely will make the diamond look cloudy.
A Faint Yellow
(J - M color) stone with good fluorescence will actually appear is if it
is Near Colorless. So, for the price-conscious consumer, buying a
yellowish diamond with strong fluorescence can actually be a gain.
Blue is the most widespread color of fluorescence. But green, yellow,
pink, white and greenish-blue fluorescence are also found in diamonds.
One Page
(Diamond Cut) 
 (Diamond Clarity and Carat)
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