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The history of diamond cutting - "Point Cut"
Point cut diamond rings are the beginning of the tradition of diamond engagement rings in Europe. Thus, Archduke Maximilian (Maximilian, 1459-1519) gave the daughter of Charles the Bold, Duke of Burgundy, Maria (Marie de Bourgogne, 1457-1482), an engagement ring with a diamond of this cut, symbolizing their unbreakable love. The ring was also decorated with smaller flat diamonds, forming a pattern in the form of the letter "M" (capital letters of the names Maximilian and Maria).
Before the invention of methods of splitting and imposing facets on diamonds, this cut was the only possible one. The technique of such stone processing consisted in polishing the natural crystal edges or chipped surfaces of the diamond to the formation of smooth edges with sharp edges and tops. As a rule, for the manufacture of such a cut, metal circles and diamond powder were required, which were obtained by splitting unworkable diamonds. Diamonds in antique items have just such a cut in the form of regular or distorted octahedrons and, rarely, dodecahedroids.
This type of cut has also been applied to other high-hardness gemstones such as spinel and corundum.
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.