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Blog

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. ...

The stone, later called "dianite", macroscopically is a dense rock of cryptocrystalline structure, characterized by bluish-gray and blue colors. ...

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. ...

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 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 ...