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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 ...

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. ...

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. ...

In Russian, the term “amber” is borrowed from Lithuanian from “gintãras” - the name of lithified resin fossils from the coast of the Baltic Sea. ...