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Unusual growth structures in amethyst
Amethyst was studied in our laboratory, which was of natural origin, but also had some unusual optical properties. It showed unusual growth structures that resemble "chevrons" in a synthetic emerald. They were most clearly seen in a plane perpendicular to the second-order crystallographic axis.
Also in the plane perpendicular to the optical axis, an intense manifestation of twinning according to the Brazilian law was observed, expressed in the form of a pattern of interference sawtooth figures.
The amethyst itself was characterized by a light color, the presence of colorless mineral inclusions of an elongated shape and small isometric colorless inclusions with a high relief.
Further study of the cut stone by infrared spectroscopy confirmed the natural origin of this stone.
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.