Turquoise blue (chalk )Uzbekistan (Uchkuduk )

The price per gram without a choice.
Weight from 0,3 to 4 grams.
With the choice and selection of color, size,"pairs" or "threes" will be 450 rubles per gram.

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Turquoise - jewelry and mineral with a very long Gemological history..
Chalk turquoise( one of five varieties
natural turquoise) is a porous (hygroscopic) light bluish-green turquoise.
This turquoise is selected, pale blue, impregnated with nothing, no resins or paraffin, no wax, no glue.
Regardless of the morphological types of the turquoise, the output of gem-quality material from mined material does not exceed 10%.
Due to the popularity and value of the turquoise in the past few decades, the market appeared a countless number of treatments and synthetics. In fact, it is difficult to find a natural than processed or artificial.

Turquoise can "grow old", because of the porosity is largely exposed to the effects of fats and chemical compounds, especially organic range. This creates the risk of contamination and requires the use of refinement. It is believed that the global market goes to 90% of turquoise in form. To eliminate the finish it is often soaked with animal fat, wax or paraffin, so-called. provoschen turquoise, but more of different resins. This reduces its porosity and increases color intensity. Color enhancement in the surface layer of turquoise to bright blue is produced by processing of 5-30% aqueous solution of phosphate of copper in the 90-180 and pressures up to 200 atmospheres.It is also aniline colors or applying to the etched surface should be pre-film bright-blue organic polymer. Chalky and porous turquoise is impregnated with colloidal silica or glue Teatrino, which gives it brightness, great hardness and best polishing. A large part of Arizona turquoise from the US is ennobled by impregnation with plastics. Likewise, turquoise from Teghout deposits in Armenia. Insertion in this Supplement, dye enable you to get the blue color corresponding jewelry turquoise. This so-called reconstituted or stabilized turquoise. When it is heated above 250 degrees, the blue color is replaced by green.