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Milarit
Milarite is rarely used in the form of faceted stones, but still this beryllosilicate from the milarite-osumite group can be found in jewelry. Its hardness allows it to be used in the form of inserts in jewelry (6 on the Mohs scale), in terms of fragility, the mineral approaches beryl, which, although it requires protection from shock, is not critical for the process of cutting and making jewelry. Most often, the stones are colorless or have a pale color in pink, yellow or green tones. Stones, as a rule, are faceted either in a step cut or in a combined one, such as "radiant". The greatest number of cut-quality milarites comes from the pegmatites of Brazil (Minas Gerais state) and Namibia (Erongo region). Moreover, stones from Namibia can have a bright yellow color, which makes them very attractive in jewelry. But such stones must be checked for possible radioactivity, since the area of their extraction is also the area of development of industrial uranium mineralization, often combined with semi-precious mineral bodies.
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.