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The hardest stones to cut
At the beginning of the 20th century, diamonds from Australia were considered as such, since their hardness turned out to be slightly higher than the hardness of diamond polishing powders. But with the development of demand for collection cuts, a wide variety of stones began to be processed. Not all of them have the hardness and strength of gemstones. Among these, there are stones, although common, but very difficult for cutting work (for example, halite). However, the most difficult to cut is the native mineral - sulfur. The fact is that sulfur crystals are very fragile, while being sensitive not only to shock and pressure, but also to temperature extremes. As a result, not every cutter will undertake to cut sulfur with a guaranteed yield. Large samples of cut sulfur are very rare and adorn any collection.
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.