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Black diamond. What is important to know.
If you decide to buy jewelry with black diamond / diamonds, it is important to know a few features of the market of these stones.
First, most black diamonds are subjected to refinement (external influence) methods of heating and irradiation in order to give them a rich black color;
Secondly, often instead of natural black diamonds sell synthetic, obtained by pressing diamond chips by HPHT-processing;
And thirdly, there is an elementary substitution of diamonds on imitation - cubic Zirconia or moissanite, which the ordinary man in the street can not distinguish.
Be vigilant. Check your future purchases with professionals.
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.