Cordierite

Cordierite, also known as iolite, "fish sapphire", "lynx sapphire", is used as a gemstone and gemstone. Previously, cordierite inserts were often passed off as sapphire, and now cordierite, which has a blue with a violet tint, cordierite is often passed off as tanzanite. However, it is easy to distinguish this stone from others by its characteristic dichroism from violet-blue or blue to gray, sometimes with a yellowish tinge, as well as by the often observed internal inclusions in the form of thin needles. The most famous of the cordierites is installed in the agraph for the hat of the sapphire set of Augustus the Strong (German August II. Der Starke; Polish August II Mocny, 1670-1733), Elector of Saxony, King of Poland and Grand Duke of Lithuania. The cordierite is cut in the style of the old Indian cut, reminiscent of the rose cut.

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В геммологической практике бывают весьма увлекательные случаи с диагностикой ювелирных вставок

Но помимо редкости цвета и высокой стоимости таких камней, многие розовые камни выделяются одной замечательной особенностью – они проявляют плеохроизм, то есть в зависимости от положения осмотра камня он может иметь дополнительные оттенки – оранжевый или пурпурный.

Currently, gemstones are produced by two fundamentally different technological methods - the High Pressure - High Temperature method (“HPHT”, High-pressure & High-temperature) and the Chemical Vapor Deposition (“CVD”, Chemical vapor deposition) method. The "HPHT" method is the most tested classical synthesis method, which can be used both carbon deposition on diamond from flux melts and catalytic reactions. In "CVD" synthesis, diamond growth occurs on a seed during carbon deposition mainly from a gaseous medium at relatively low temperatures and pressures.

Jewelry and precious stones are just such a category of goods, when buying which you need to pay attention to many criteria.

Sogdianite is a rather rare mineral and more often it can be found as a collection material (moreover, in systematic collections), and it is extremely rare in jewelry.