08:29
Mody87
Engagement Rings Object of the present research are jewelry, got on an exhibition in Hamburg as stones from Namibia. The studied pomegranates differ a similar chemical compound and, as consequence, close optical properties. The established variations of structure are connected with presence of an impurity of iron, the quantity in the studied samples varies from 3,7 to 15,5 pier. The maintenance of other impurity slightly, maximum maintenance and make 1,3 and 1,4 pier. accordingly.
06:56
Mody87
The estimation of diamonds of jewelry quality depends on size of a crystal, its colour, degree of a transparency, the form, presence or absence of cracks and inclusions, and also micro defects Engagement Rings. The size of jewelry diamonds is estimated in carats, i.e. in the weight units corresponding to a parity: 1 carat is equal 200 mg of weight. It is so called metric carat which is accepted since 1907 under the decision of General conference of measures and scales in Paris. The term carat has most likely the Greek roots and goes from seeds of acacia Seratonia siligna which average weight is equal approximately 0,205 G.Smith, 1980 . Weighing of diamonds is carried out on electronic scales to within 3rd sign after a comma.
05:25
Mody87
Engagement Rings: Features of the diamond market. In sphere of world goods turnover diamonds carry out a double role. Their smaller volume from extraction passes in the category of jewelry raw materials, in the category technical. In concrete deposits of a parity of those or other groups considerably vary, but, as a rule, technical diamonds prevail over jewelry in and, and jewelry in scatterings. So, for example, the maintenance of diamonds in radical deposits of Southern Africa makes from 15 to 50 , and in scatterings from 50 to 93 . Only in few scatterings the maintenance of jewelry diamonds decreases to 25 Bakwanga .
03:07
Mody87
These are so called crystals. They consist of an internal kernel and a peripheral cover learn more on engagement rings http://www.offshelf.com/. The kernel, as a rule, is presented by the colorless octahedron similar on physical properties to crystals of a version I, and a cover an octahedron if it has an insignificant thickness. At increase in a thickness last changes the form itself and changes the kernel form, giving to all crystal cubic shape. At dissolution of sides the crystal turns to the roundish. Thus, forms of these difficult crystals can change from octahedron and their doubles to cubes and roundish dodecahedrons. Coloring of crystals of a difference IV is defined by color of covers and more often has a yellow and chartreuse shade. Characteristic property of this version is presence of single atoms of nitrogen with paramagnetic properties. The isotope structure of carbon in a kernel and in a cover is close on the indicators and corresponds to a source.
00:52
Mody87
Since 1995 in Sierra Leone the company Rex Diamond Mining Co has developed search and exploration, research by http://www.offshelf.com/. In 1996 its representatives have informed that on the area of Tongo by them are found out veins in which look ahead stocks at a rate of 19,0 million carat in average cost in 3,3 dollars are counted up. It is supposed that by 2001 extraction of diamonds will make on a deposit of 600 thousand carat annually, bringing profit in 50 million dollars.
23:16
Mody87
Engagement Rings The status of a geological nature sanctuary object of a geological heritage , geo site provides preservation of object from destruction, its all round studying, visiting by students, research groups, an extended coverage in scientific and popular scientific mass media. In a case with deposits of Southern Ural Mountains, performance of the given conditions does not demand carrying out of any special actions and additional expenses. It is necessary not to grant further only the license for working out of deposits for manganous ores.
21:20
Mody87
Synthetic diamonds are applied, basically, for technical needs learn more on engagement rings http://www.offshelf.com. The most widespread forms of use of technical diamonds are: The diamonds which are exposed to processing for the purpose of reception of grains of the certain geometrical form. Such diamonds go on manufacturing of cutters, drills, tips for measurement of hardness, tips for measurement of cleanliness of a surface, contacts, bearings
The raw crystals of diamonds used for various tools chisel crowns, almazo metal pencils, frames for editing, contacts
