What to pay attention upon diamond purchase to?Diamond - neogronenny diamond are the firmest stone. Generally they are colourless, diamonds meet shades yellow, brown, lilac, is more rare - bluish and green color. In the Middle Ages attributed to diamond mystical properties. Was considered that it provides to the owner force and bravery, and also it is capable to drive away powers of darkness and to strengthen love of the husband to the wife.
It is interesting that the small stone can be more expensive of, than larger if that the lowest quality. Diamonds have characteristics - purity and deficiency, they are specified on a product label. Therefore, buying diamond, it is necessary to pay first of all attention to these two figures. On a label of ornament there can be, for example, such formula: 2 Kr 57 - 0,10 4/2. Figure means that in a product two diamonds; “ Kr “ - their form of a facet classical round; “ 57 “ - the quantity of sides in a facet of one diamond, are a standard diamond facet, happens and simplified - in 17 sides; “ 0,10 “ - the weight of both diamonds in carats. Then there is a fraction “ 4 / 2 “: in numerator “ 4 “ - figure of color of a stone, in a denominator - deficiency figure. So, chromaticity 7 is just brown crystal, 5 - yellow, 4 - slightly yellowish. The most qualitative and expensive stone has designation 1/1. That is unit - colors and unit - defects.
But such crystals meet very seldom and cost madly much. They are called " diamonds; " clear water;. This saying came from antiquity when to distinguish diamond from a fake, the crystal was thrown into clear water.
Indices of refraction of diamond are that that if the crystal which is not stirred up (that is its characteristics 3/3 or above), then in water he is not visible while any other transparent stone has other indexes of refraction and it is noticeable in water. Diamond can possess all flowers of a range, but the most precious - white. Colourless, snowy - white diamonds the most rare and therefore the most expensive.
There is a special color scale by which stones are classified. Colourless stones have degree of D. Each following letter of the alphabet characterizes stones with more yellow shade. The best way to see the true (truthful) color of diamond - to look at it on a white background. Multi-colored stones are appreciated density of color though colourless, in turn, are appreciated lack of color. Exists how main institutions, who are engaged in certification of diamonds.
the Most authoritative international organization which is engaged in certification of diamonds - the American gemological institute (JIA). In Russia three certified centers having the license for this kind of activity work: The Smolensk gemological certified center at SKTB “ Crystal “ the Russian state assay chamber in Moscow, the certified center at Committee on precious stones in Yakutia. They estimate quality of a stone according to the TU system accepted there - specifications.
The cost of a stone is formed from so-called four Xi: weight, form, color and quality. Weight is measured in all the known carats, the form is a type of a facet: round, oval, pear-shaped, “ princess “ “ emerald “ and so on. As for color, if it is about usual, not color diamonds, the most expensive stones - “ is more white white “ or with small bluish outflow, stones with yellowish and brownish outflow are less appreciated, for example, in the Russian classification for stones heavier 0,3 carats are allocated to nine flowers - from the first, “ colourless “ to the last, brownish.
For quality there is also the scale depending on stone weight. For stones weighing from one to several carat there are thirteen degrees of quality (from the highest, the first, to the thirteenth), for their large stones it is more. One more factor influencing a stone assessment - facet parameters: symmetry, proportions, quality of a surface. In certificates of LA they are estimated by adjectives: excellent, very good, good and so on, at us - simply letters A, B, B, G. Otsenivayetsya also purity of a stone, that is existence in it of impregnations, cracks, points - light and dark.
To choose diamond, it is necessary to pay attention to its purity. Purity of diamond is influenced by internal defects and external roughnesses which were brought by the nature. Such defects as spots, bubbles or lines are called inclusions.
Though these shortcomings also do diamond unique, the it is less than them, the stone is more expensive. Inclusions can be an obstacle for passing of light through a stone, reducing a sparkling, and respectively, product value.
Finally there is a wish to add that the most expensive transparent diamond in the world was extracted by Steinmetz Group firm in the Republic of South Africa - 103,8 carats, it only 5 carats easier well-known “ Koch - and - the Hole “ decorating an imperial crown of Great Britain. The approximate cost of this diamond makes at least 1,1 million Swiss francs. When diamond was found, it is unknown, however, according to Sotheby`s, its facet masters of Johannesburg and New - York took 18 months.]