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Diffusion as a refinement method
In simple terms, diffusion is a surface staining of a stone. Most often, diffusion enrichment is used for corundums, in particular sapphires.
The physical meaning of diffusion is to bombard the stone with certain ions, which penetrate inside and give the stone one color or another. The diffusion process is necessarily accompanied by heating, as it promotes the diffusion of molecules. Depending on the size of the ions, their penetration into the stone can have different depths. Accordingly, the smaller the particle, the deeper it penetrates the refined insert. An example is the beryllium diffusion of sapphires, as a result of which beryllium ions, due to their small size, penetrate almost the entire volume of the stone. The result of this treatment is a pinkish-orange color of sapphire. If it is necessary to color sapphire blue, then it is bombarded with titanium ions, which, unlike beryllium ions, penetrate only into the surface areas of sapphire, which can be removed by polishing the stone.
In addition to enhancing the color, diffusion is used to process opaque cabochon cut sapphires to enhance the effect of asterism.
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.