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Gems of the Moscow Region
Many regions of the world are famous for their gems: Australia, Badakhshan, Ural, Brazil, Tanzania and Kenya, South Africa, Yakutia and others. From an inexperienced point of view, it may seem that the central part of the East European Platform, namely the region of the Moscow region, is deprived of gems. After all, academician Fersman E.A. in his work “Gems of Russia”, he wrote that “Our Russian plain does not give a stone either ...”, but this is far from being the case. It is reliably known that even in the 14th century flints of the Moscow region were used to decorate the decoration of Moscow palaces and temples. Also, since the 16th century, the use of agates and quartzes from the Moscow region in the decorative design of costume elements and church supplies has been noted. True, the number of local stones cannot be compared with the huge mass of imported material from Europe (amethysts and agates from Germany), America (Mesoamerican emeralds) and Asia (garnets, spinels, rubies, sapphires and other stones, as well as from other regions of Russia - with Pomorye and Karelia (amethyst from the quarries of Cape Korablik, dark red garnets from the Shuya River, river pearls of the northern rivers). But, nevertheless, the fact of using local gemstone material remains a fact. Currently, not only the indigenous sources of gems are known in the Moscow Region region (Prioksky manifestations of agates, pale-colored amethysts of Rusavkino and other places, a variety of lilac ornamental fluorite in the vicinity of Vereya, called "ratovkit", after the rivulet of the same name, with which the place of its original description is associated); in placers formed from moraine deposits, garnets and even small gem-quality zircons, which, however, can be classified as very rare finds. Colored flints were brought to the Moscow region, whose range of colors is very wide, except that there are no blue stones. Here, deep black, gray and brown stones of various shades, bright red flints resemble the purple jasper of the Urals, yellow, white and even green stones are found. And flints are widespread not only in numerous “breakings” of stone, and in quarries for the extraction of sand and gravel mixtures, but also in alluvial deposits of rivers. Flint near Moscow is widely used by stone cutters throughout Russia - it is difficult to find a more fertile material for cutting - hard, dense, isotropic. Recently, silicified corals and "marble onyx" of belemnites (the so-called "devil's fingers") are used for inserts in jewelry (usually in author's works made of silver). Along with amethysts, pale-colored prazems are rarely found, suitable for facet cutting. Despite their poor coloration, their color is not caused by mineral impurities, which provides them with the transparency of amethyst and citrine, and is not associated with refining processes.
We are starting a new cycle of publications about great researchers in the field of gemology and mineralogy. ...
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. ...
