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Is laser engraving on the girdle a guarantee of diamond authenticity?
The technology of engraving the numbers of expert opinions on diamond gangsters was first used by the US GIA laboratory in the early 2000s. Initially, engraving was applied at the request of the client, and later became mandatory for large sieving stones. The purpose of introducing laser engravings was to protect the diamond from the substitution and simplify its identification. For a long time, this method regularly performed its function, but with the development of technology, laser engravings on diamonds began to be forged.
In connection with quite frequent cases of stone substitution, verification of the diamond’s compliance with the GIA conclusion is carried out comprehensively: by the number on the gandist and all the main parameters of the canm by comparing the real values with those indicated in the GIA expert opinions. It is also necessary to compare the defects in the diamond with the scheme (plotting).
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.