Precious stones: the diamond
THE WHITE DIAMOND
A little history...The diamond is considered as the queen of gemstones. The Greeks gave her the name of Adamas, symbol of power and courage. In the nobility, the symbolism of the diamond is wealth and sovereignty. In Europe, we lent her the power of protection against the enemies and the poisons. Today, the diamond is considered as universal symbol of love, constancy and purity. There is a stone of predilection for engagement rings.
India was the first producing country of diamonds. The first tracks of production are in the mines of Golconde. The mines were exploited up to depletion of resources. Today the main producing countries of diamonds are South Africa, Botswana, Angola, Congo, Guinea, Russia and Canada.
THE 4 C
4C of the diamond, four absolute criteria for assessing the quality and value of this gem. These criteria are: color (Color), cutting (Cut), purity (Clarity) and weight (Carat).
THE COLOR (Color):
more a diamond is colorless, the more it has of value. The the most used color scale is that of the GIA (Gemological Institute of America), which breaks down as follows:
E → exceptional white
G → extra white
I → nuanced white
K à L → slightly tinged
M à Z → tinged
THE CUTTING (Cut):
The size reveals the brightness of the diamond. More the size is good more the diamond will shine. It is one of the most important valuable criteria. The most known size is the brilliant, it account 56 facets + one. The quality of the cut is signified as follows:
THE PURITY (Clarity):
One it defined according to the number of visible inclusions in a diamond. Most of the diamonds contain very small natural inclusions. The number of inclusions, their sizes and their types determine the value of the stone. The more the number of inclusions is big, the more the stone loses of its value. The degrees of purity are estimated as follows:
THE WEIGHT (Carat):
One carat is equal to 0.20 g. The word "carat" come from "Kuara" carob seed, the fruit of the carob tree. Due to their constant weight, the Kuara is used as counterweight for scales, of the ancient times up to 1907.
The weight is measured in hundredths and the carat is divided into 100 points. There is talk of a "25 points" to talk about a 1/5 of a carat and a "half point" to talk about a 1/2 carat. But beware, weight is not the only factor that determines the value of a diamond. Big does not necessarily mean better. The carat is not dissociated from other 4C mentioned above. Color, cut and purity are essential to the price estimate.
THE FANCY DIAMONDS
A little history...The diamonds of colors (Fancy Diamond) are particularly rare and precious. We find 1 diamond of color for 10 000 colorless diamonds. They are very small for the greater part do not exceed one carat. Contrary to the colorless diamonds, the more the coloring of the diamond is intense, the more its value increases. They exist in almost all the tints and in the very diverse intensities. Yellow, pink, blue, red, orange, green, black, cognac, champagne, etc.... Certain colors are extremely rare, as the red, the green, certain intensities of blue or pink. It is important to note that the so-called colored diamonds synthetic or processed, are in no way comparable to the rarities offered by nature.
THE BLACK DIAMOND
A little history...The black diamond or Carbonato is certainly less known than the white diamond, but he is more and more appreciated. Very rare, one finds it only in Brazil and in Republic Center Africa. Rejected until 1999 by the creators, the Swiss jeweler De Grisogono who launched brilliantly this unusual stone.
But the success of the black diamond, the growing demand and the fact of its rarity, make that one finds most frequently on the market of diamonds handled by irradiation (color enhanced). This is one of data important to know, because very few jewelers will make the effort to specify it during the sale. So, ask the good question during your purchase: natural or stained diamond?
Another datum to be taken into account is the quality of the cut. Yet the same index of hardness as the white diamond, the black diamond is more difficult to cut and especially to polish, he thus asks for a particular know-how. The stone can lose half of its value if the size is poor quality. She has to present neither of asperity nor any visible defect to the naked eye.
In summary the black diamond is rare and expensive, a jewel with moderate price is for blow sure realized with coloured stones, to offer you of real black diamonds, look at rather the side of the place Vendôme …