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Another rarity - Irnimite
Irnimite is the name of a variety of banded-spotted jasper, which has a distinct blue and blue color due to the admixture of rhodusite. Jaspers of this type at the deposit are usually represented by variegated-colored varieties: spotted-banded precipitates of various shades of blue are interspersed into the main massif of jaspers, which have gray, brown and brown colors. Irnimite was first discovered in the second half of the 1960s during exploration of the Irnimi rhodonite deposit. This variety of jasper was named after a deposit located in the Ir and Nimi river basins (Khabarovsk Territory). Irnimite reserves have been calculated at the Dzhavodi and Bom sites; in addition, promising deposits have been identified at the Pestry and Zaoblachny sites. The productive bodies of irnimite are usually located separately from the bodies of rhodonite. The best examples of irnimite have a bright blue color and can be comparable in color to lapis lazuli. Irnimite is currently not industrially mined and is very rarely found in jewelry.
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.