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Simpsonite
Simpsonite is one of the rare collectible gemstones. This mineral is found in the form of gem-quality precipitates in Australia, Brazil and Zimbabwe. In the places where this mineral is located, known in other countries, including Russia, no stones suitable for making gem-quality cut have been found. The mineral is characterized by a range of colors in yellow tones, up to colorless. The hardness of the mineral - 7-7.5 makes it suitable for use not only in the form of collection cuts, but also for inserts into jewelry. The mineral received its name, of course, not in honor of the famous cartoon American family. The mineral was named after the Australian mineralogist, chemist and educator - Edward Sydney Simpson (1875-1938).
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.