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August 7 - Eric Laxman's birthday
We are starting a new cycle of publications about great researchers in the field of gemology and mineralogy. July 27 (August 7), 1737 - Russian naturalist Eric Gustav (Kirill Gustavovich) Laxman was born in Nyslot, Sweden (now Savonlinna in Finland). In 1764, having accepted the position of pastor of the Lutheran community in Barnaul (from 1764 to 1768), he was also engaged in mineralogical research when traveling to the borders of Mongolia and China (up to Kyakhta), as well as through the territory of the Nerchinsk mining district. In 1781-1782, he served as assistant chief (Oberbergmeister) of the Nerchinsk mines. Since 1782, he entered the position of a mineralogical traveler in the Empress's Cabinet (with an academic pension of 200 rubles a year and a salary for travel of 600 rubles a year). From 1784 he lived in Irkutsk, from where he made numerous trips to Eastern Siberia. In 1784, together with Alexander Andreevich Baranov (1747-1819), he founded a glass factory with a new glass-making technology on the Taltsa River in the vicinity of Irkutsk. In 1785, at the direction of the hunter Lapshin, he found a root manifestation of lapis lazuli in the valley of the Slyudyanka River. Also, Laxman discovered a coal deposit near the village of Cheremkhovo (from the Buryat "sheremkhe" - "coal") in 1786. At present, jet-like saprocolites are found in this deposit, but the main source of "Siberian jets" is the discovered and developed in a later period, the Mataganskoye deposit of the Cheremkhovo coal basin. Also in 1790, he discovered manifestations of grossular on the Vilyui River and a mineral of the Vesuvian group called viluite (viluite was recognized as an independent mineral species only in 1998). He died on January 5 (January 16), 1796 on an expedition. He was buried at the Yamsk station Dresvyanskaya near the Vagai River (118 km from Tobolsk).
We continue the cycle of significant days and people in gemology and mineralogy ...
The main indigenous industrial sources of diamonds are kimberlites and lamproites – alkaline-ultrabasic rocks of ancient platforms, forming mainly tube-shaped bodies, dikes and veins. ...
The world's largest platform for trade with diamonds is the "Rapaport", the price lists which guided the vast majority of diamond merchants in the world ...
When a Gemological study of stones and other jewelry gemologists use a wide range of equipment ...
Defects in jewelry significantly affect its consumer properties as a luxury, a decoration or status of the accessory, and, accordingly, limit its scope or make completely unusable ...
During one of the diagnostic examinations in our laboratory, the study of jewelry inserts in jewelry imitating black diamond, identified a variety of boron carbide a black color ...
The definition of authenticity, including tributaria, jewelry is a highly demanded field of expertise associated with expertise of the jewelry. Very relevant these types of activities when making secured transactions or sale-purchase jewelry in the ...
As is known, the motivation of consumers is an important aspect that is of particular importance for the prospects of market development, diamond products are most often purchased on the occasion of significant events and celebrations as gifts. One ...
As is known, the motivation of consumers is an important aspect that is of particular importance for the prospects of market development, diamond products are most often purchased on the occasion of significant events and celebrations as gifts. One ...
The definition of a gemstones, its origin and methods of refinement, if such has been applied, is one of the main objectives of Gemological expertise by expert Gemological laboratories ...
The lab was presented the crystal, in appearance resembling a natural diamond. The stone had a light-green color, the shape close to octahedral, and the weight of 9.71 ct. Its size was of 11.79 x 11.61 x 9,69 mm. ...
In determining the authenticity of a diamond, a gemologist should determine: Is this diamond made of diamond and is it natural; Has a diamond been trimmed to improve color and or clarity; The quality characteristics of the diamond " ...
This note will be useful to jewelry owners who wish to return, exchange jewelry that does not meet the requirements and expectations of the consumer. ...
The color of most natural topaz is associated with radiation defects in the structure of the crystal lattice of the stone. But, as a rule, natural stones do not possess residual radioactivity. Exceptions can be stones with internal inclusions of min ...
For the first time, the term “Pigeon’s Blood” (“Pigeon Blood”) was introduced by GRS (Gemresearch Swisslab) in 1996 for the qualitative characterization of ruby color in gemmological reports. In 1998, rubies with gemological reports describing color ...
When buying a diamond, it is important to understand which components form the price of a diamond. ...
Verification of the gemstone for authenticity, as a rule, consists in checking the gemstone (insert) for compliance with the information stated during the sale-purchase ...
Everyone who ever bought or wanted to buy expensive jewelry with precious stones in the secondary market, faced with the need to check the stones in the product for authenticity and for compliance with the data stated by the seller. ...
Inclusions in stones is one of the diagnostic signs, because a detailed study of them can often help establish the nature of origin, the presence of external influences (refinement), and sometimes even the deposit and conditions for stone formation. ...
In Russian, the term “amber” is borrowed from Lithuanian from “gintãras” - the name of lithified resin fossils from the coast of the Baltic Sea. ...
All deposits of fossilized fossilized resins are of exogenous origin, that is, are associated with factors of geological processes acting on the Earth's surface and in the upper layers of the lithosphere. ...
Usually chalcedony is most often found in the form of an unattractive dull gray or almost colorless variety, however, there are also colored chalcedony, which is an attractive material for making jewelry. ...
The modern opal market is filled with a variety of stones and products made from them, and prices for these stones can vary more than a thousand times ...
In practice, in the trade of marine cultured pearls produced by mollusks of the species Pinctada maxima and Pinctada margaritifera, as a rule, they adhere to a system of 4 gradations: "A" ("D"), "AA" ("C"), "AAA" ( "A / B"), "AAAA" ("A"). ...
The lack of deep green and clear emeralds is often compensated by refining stones in color and clarity, as well as synthetic stones. Simulations are also used to a lesser extent for this purpose. ...
The stone, later called "dianite", macroscopically is a dense rock of cryptocrystalline structure, characterized by bluish-gray and blue colors. ...
