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Three "faces" in sapphire
Today we will talk about three minerals, named after researchers, found in the form of inclusions in sapphire, important for its diagnosis and determination of the fact of heat treatment. Boehmite, which is found in the overwhelming majority of natural sapphires, should rightfully be called the first mineral. It was named in 1927 by Jacques de Lapparent (1883-1948) after the Austro-Czech chemist and crystallographer Johannes Böhm (1895-1952). The second mineral is goethite, which is also present in natural sapphires and is an excellent indicator of the heat treatment of stones. When sapphire is heated to temperatures at which the qualitative characteristics of color and purity change, goethite turns into hematite. The mineral was named in 1806 by Johann Georg Lenz (1748-1832) in honor of the German writer, philosopher and naturalist Johann Wolfgang von Goethe (1749-1832). And the third mineral is gibbsite, which is also found in natural sapphires in the form of microinclusions. The mineral was named in 1822 by the American biologist and mineralogist John Torrey (1796-1873) after the American naturalist George Gibbs (1776-1833).
Currently, for the production of jewelry inserts, diamond synthesis is carried out using two main synthesis methods
The first description of the synthesis of emerald is given in a number of works by Jacques Joseph Ebelmen in the period 1846-1851 (1814-1852). However, his experiments had more scientific significance, although they showed the possibility of synthesizing such stones as emerald. And until the early 1890s, experiments in growing emerald had no commercial significance.
Opal, as a gemstone, captivates with its unique shine and play of color. However, in order to preserve its exquisite beauty and ensure a long service life,
For a long time, during which humanity dealt with precious stones, gemology was not singled out as a single science.
The asterism effect in gemstones is caused by the unique crystallographic properties and internal structure of minerals.