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"Jewish" stone. What is this and where does the name come from?
"Jewish" stone, it is also written granite, is a pegmatite rock, the bulk of which is feldspar from pinkish to beige in color, and inclusions are represented by quartz. Colorless or almost colorless inclusions of quartz have an elongated appearance and are oriented in one direction. They permeate the enclosing feldspar throughout.
Such an interesting name, “Jewish” stone, this breed received due to its similarity to saw cut with ancient biblical writings - the light feldspar resembles parchment, and the inclusion of quartz is the text written on it.
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.