The colors of the diamonds are graded on a scale similar to the alphabet, the difference being that the missing letters A, B and C, starting at D and continue to Z.
In this grading system colors D, E, and F are only considered to be completely colorless, or as some call them, not very fair, "white".
D is of course the best, the rarest and, of course, the most expensive color.
Some diamonds enter the finish area of the stairs color to Z (light yellow), but not the special colors of the colors available, most buyers opt for colors from D to J, after the GIA system.
Thus, DEF are Grade "colorless" and GHIJ are the "near colorless".
The differences between each point are very subtle, and comparison of color is the special light.
When viewed front, all people tend to "classify" diamonds as between I and J.
Diamonds in special colors, unique are officially called "Fancy, and are very rare, also being considered as doing part of this grading.
They occur in every color like the rainbow color of light seen through a prism, actually.
The rarest colors are red and purple, and combinations of these two colors.
Yellow and brown are the most common color of diamonds, but the colorless are the most popular jewelry industry.
However, today, colored diamonds appear increasingly in several jewelry shops becoming more popular and, of course, beautifully mounted in different combinations of colors in stylish jewelry.
The green and blue ones are extremely rare, especially the natural color.
In some cases a little diamond colored by nature (usually those in pale pink, pale blue, etc.
) can be irradiated in order to intensify the color.
This can be obtained by a radiation in fields of low intensity, which are designed in stone already cut and polished so as to get a darker color than the natural one.
This process creates a permanent color and it is accepted as a method employed in the diamond and jewelry industry.
Anyway, an irradiated jeweler trader must be declared by the client.
But a natural colored diamond "fancy" color, will cost much more than one irradiated.
However, the diamonds are colorless accepted because no color in an increased ability to play the "fire" in all colors of the rainbow.
After all, the more a stone is close to being colorless the more rare, and its value is considerably higher.
On the other hand, diamonds are sought after by some collectors rare fancy colors.
These ones, which are extremely rare and very expensive, reflect the color of the rainbow in "fire" their sparkling but in combinations of red, pink, blue, yellow, orange, green, brown and even black.
Of these, the yellow stones have become the most popular, while red, pink, blue and green are very rare.
In addition, the discovered colored stone size is generally smaller than other diamonds and therefore their cut is based on maximizing the color, not clarity, like in the other diamonds.
There are other techniques of "treatment" of the colors, used to enhance or improve the natural shade, but are very little used by the elite jewelers.
However, these treated stones worth much less than the naturally colored stones and must mention that they are treated in their certificate.