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Cinnabar
Cinnabar is a mineral known to be one of the main sources of mercury. Also widely known is the powder from this mineral, which has long been used as a mineral dye. But one rarely hears about the manufacture of faceted inserts from cinnabar. Despite the low hardness of only 2-2½ on the Mohs scale, as well as increased brittleness, this mineral, which has a bright color and a high degree of transparency, is faceted in order to obtain collectible faceted inserts, which, having a bright red-scarlet color, look very impressive. But such cuts cannot be used in jewelry designed to be worn due to the high concentration of the heavy metal. In addition, stones with significant selenium content should not be stored in direct sunlight, in order to avoid losing their bright red color and the appearance of a gray tint.
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.