Such different olivines

In gemology, speaking of olivines, they most often mean forsterite (including synthetic, sometimes imitating tanzanite) and chrysolite (a jewelry variety of forsterite with a small amount of fayalite minal), sometimes they recall tephroite, which is part of rhodonite rocks, as well as fayalite. However, not everyone knows about such minerals as monticellite (an intermediate member of the forsterite-calcioolivine series) and libenbergite, which in its own form is not used as a jewelry stone due to the small size of the segregations and the high fracturing of the grains, but even a slight admixture of it in chrysolite adds to the latter. juicy green color, so valued in this stone. Now about monticellite. It is little used in faceted form, which is explained by the predominance of greenish-gray color among its colors. But recently, the fashion for gray stones has opened the way for predominantly gray monticellites with a very weak greenish tint. And if earlier monticellite crystals could be seen in mineralogical collections, and cuts in the collections of gemologists, now we are getting ready to meet this stone more widely in jewelry.

Other publications

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.