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Ilvait
Beautiful decorative collectible druses of ilvaite with quartz and calcite from the deposits of the Dalnegorsk ore field are known to every mineral collector. But faceted inserts made of ilvaite are a rarity. The mineral is black, opaque, but has a distinct semi-metallic luster, reminiscent of the brilliance of a faceted black diamond, and the hardness of this mineral allows it to be used in jewelry (5.5-6 on the Mohs scale). Its only drawback is fragility. But for collection cuts, this factor does not lower their consumer properties, but in jewelry, fragile stones are most suitable for use in earrings and pendants, limitedly - in brooches, the use of such stones in rings and bracelets should be due to a protective setting.
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.