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| Diamonds come naturally
in almost every color of the rainbow. However, most people
prefer diamonds in the white range. Colorless diamonds are
more valuable, because they are rarer and their lack of color,
or whiteness, in a diamond that allows the light to pass effortlessly
through the stone and disperse that beauty back to the observer.
The color grading scale established by the GIA (Gemological Institute
of America) varies from D (totally colorless) to Z (light yellow).
D through F are virtually colorless. G, H and I diamonds
appear colorless when mounted. J, K and L diamonds look
very nearly colorless, but you can see some color in larger stones.
Beyond M, most people can see color pretty easily. The color
of the metal in a mounting can either mask or enhance the diamond
color. Yellow gold makes slightly yellow or brown diamonds
appear more colorless. White mounting (gold or platinum)
makes the color more perceptible. |
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Fluorescence
is not formally a color grading term. Many diamonds
glow when exposed to light which contains relatively high
amounts of ultraviolet. This is due to a natural interaction
between the light's energy and the atoms in the diamond.
Some diamonds (about 10%) fluoresce strongly enough so as
to be somewhat noticeable in regular (incandescent)
light. Generally, for very light yellow color diamonds,
fluorescence is considered to be beneficial since it makes
the diamond appear whiter.
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