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Stone flowers
Stone flowers are aggregates of individual crystals that form an aggregate that resembles a flower. The most famous of the large family of flowers that grow in underground "greenhouses" are gypsum "roses" from the Arab Maghreb. At the very end of the 20th century, celestine, barite-celestine and barite "stone chrysanthemums" from China appeared on the mineralogical markets, represented by intergrowths of white crystals on the black surface of bituminous and carbonaceous shales. Intergrowths of goethite crystals from chamber pegmatites of Volhynia, forming black rosettes and resembling tall grass or a chrysanthemum flower, are very spectacular. In the second half of the twentieth century, among collectors, samples of vivianite from localities on the Kerch and Taman peninsulas were popular, represented by sheaf-like crystals of a dark blue-green color in the form of flowers blooming in natural underground cavities. The intergrowths of corundum (sapphire) crystals from the Middle Urals are very beautiful, resembling blossoming rosebuds. And although such samples are practically not used in jewelry, they are of interest as highly decorative collection mineralogical samples.
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.